Yes, pregnancy is still possible with one working ovary and one open fallopian tube, though timing and the reason for ovary loss matter.
Many women hear “one ovary” and fear the worst. That fear makes sense. Fertility can feel fragile, and any surgery or diagnosis tied to the ovaries sounds huge. Still, one ovary does not automatically shut the door on pregnancy.
In many cases, the remaining ovary keeps releasing eggs, making hormones, and carrying the cycle on. Plenty of women with one ovary conceive on their own. The bigger question is not just the number of ovaries. It’s whether the remaining ovary is working well, whether at least one fallopian tube is open, and whether there are other fertility issues in the mix.
This article breaks down what still works, what can lower the odds, and when it makes sense to get checked sooner rather than later.
Why Pregnancy Can Still Happen With One Ovary
Your body does not need two ovaries to release an egg each month. One healthy ovary can often take over the job. It can still produce estrogen and progesterone. It can still ovulate. It can still set up the cycle needed for conception.
That’s why a woman with one ovary may keep having regular periods after surgery or after losing an ovary from a cyst, torsion, endometriosis, or another condition. Regular periods do not guarantee fertility, but they do suggest that ovulation may still be happening.
Pregnancy needs a few pieces to line up:
- An egg has to be released.
- Sperm has to reach that egg.
- Fertilization has to happen.
- The embryo has to implant in the uterus.
If one ovary is doing its job and the rest of the system is in decent shape, pregnancy can still happen the usual way.
Does The Egg Always Come From The Side With The Tube?
Not in a neat, predictable pattern. Ovulation does not always switch left, then right, month by month. One ovary may ovulate more often than the other. After removal of one ovary, the remaining ovary often keeps ovulating on its own cycle.
That means the body can adapt. It is not “half fertile” in a simple math sense. Real-life fertility is more complicated than that.
Getting Pregnant With One Ovary: What Changes
The main thing that changes is ovarian reserve. With one ovary, there are fewer eggs left overall. That does not mean zero chance of pregnancy. It means there may be less margin, especially as age rises.
The reason the ovary was removed matters too. If the surgery was tied to endometriosis, severe cysts, pelvic infection, or cancer treatment, those issues may affect fertility apart from the missing ovary itself.
A normal cycle after losing one ovary is a good sign. Still, cycle regularity is only one clue. Some women ovulate regularly yet still struggle because of blocked tubes, scar tissue, sperm issues, or egg quality tied to age.
What Doctors Usually Check
When pregnancy has not happened after months of trying, the workup often looks at the same basics used for any fertility check. That may include cycle history, hormone blood work, semen testing for the male partner, and a scan or X-ray test to see whether the tube is open.
The ACOG explanation of ovulation and pregnancy lays out the cycle clearly, while the NHS page on fertility in the menstrual cycle explains when an egg is released and how fertilization happens.
Those basics matter more than many people think. One working ovary can be enough. One working ovary plus a blocked tube or severe endometriosis is a different story.
What Has The Biggest Effect On Your Odds
If you want a straight answer, these factors usually matter more than the single-ovary label itself:
- Age
- Whether the remaining ovary ovulates
- Whether at least one fallopian tube is open
- The reason one ovary is gone or damaged
- Endometriosis, PCOS, fibroids, or pelvic scar tissue
- Sperm health
- How long you have been trying
Age is a big one. A healthy 28-year-old with one ovary may conceive with no trouble at all. A 39-year-old with one ovary may still conceive, though the age-related drop in egg quality can make the road steeper.
| Factor | What It Can Mean | Why It Matters |
|---|---|---|
| Regular periods | Ovulation may still be happening | A cycle that keeps showing up on time is a decent early sign |
| One open tube | Sperm and egg can still meet | Pregnancy can happen with one tube if it works well |
| Healthy remaining ovary | Hormone production and egg release continue | This is the main reason natural conception can still occur |
| Age under 35 | Egg quality is often better | Age affects fertility even with two ovaries |
| Endometriosis history | Scar tissue or lower egg reserve may be present | The diagnosis may affect fertility more than the missing ovary |
| Prior pelvic infection | Tubes may be damaged | An egg cannot meet sperm if the path is blocked |
| Male factor issues | Low count or poor movement may lower odds | About half of infertility cases include a male-side issue |
| Past cancer treatment | Egg supply may be lower | Chemo or radiation can affect the remaining ovary |
When One Ovary May Make Pregnancy Harder
There are times when one ovary can come with a lower chance of conception. That does not mean pregnancy is off the table. It means the missing ovary may be part of a larger fertility picture.
If The Remaining Ovary Is Not Ovulating Well
Irregular periods, very long cycles, or months without a period can point to ovulation problems. PCOS, thyroid issues, or early ovarian failure can all affect egg release.
If The Fallopian Tube On That Side Is Blocked
A woman can have one ovary and still get pregnant if there is one open tube. If the remaining ovary is paired with a blocked or badly damaged tube, natural conception gets much harder.
If Endometriosis Or Scar Tissue Is Present
Some women lose an ovary because of endometriosis or repeated cyst surgery. In that setting, the missing ovary is not the whole story. Scar tissue can affect the tube, the ovary, or the way the egg is picked up after ovulation.
If Surgery Lowered Egg Reserve
The Mayo Clinic page on oophorectomy explains that one ovary can be removed for many reasons. After unilateral oophorectomy, many women still menstruate and can still conceive, yet the total egg supply is lower than it was before.
That lower reserve may not matter much at 25. It may matter more at 38.
Signs You May Need A Fertility Check Sooner
Some couples do well by trying on their own for a while. Others should not wait too long.
- You are under 35 and have tried for 12 months with no pregnancy.
- You are 35 or older and have tried for 6 months.
- Your periods are irregular or missing.
- You have known endometriosis, pelvic infection, or past ectopic pregnancy.
- You had chemotherapy, pelvic radiation, or repeated ovarian surgery.
- Your partner has a known sperm issue.
In these cases, early testing can save time and spare guesswork. A simple plan often starts with checking whether you ovulate, whether a tube is open, and whether sperm counts are normal.
| Situation | What Usually Helps Next |
|---|---|
| Regular cycles, under 35, trying less than a year | Track cycles, time sex around ovulation, keep trying unless a known issue is present |
| Age 35 or older, trying 6 months | Start a fertility workup sooner |
| Irregular or absent periods | Check ovulation and hormone levels |
| Pelvic pain, endometriosis, or prior infection | Check tube health and pelvic anatomy |
| Known male factor issue | Get semen testing early |
| One ovary plus blocked tube suspicion | Tube testing is often high on the list |
Ways To Improve Your Chances
You cannot change the number of ovaries you have, but you can tighten the basics that give conception the best shot.
Time Sex Around Ovulation
The fertile window is short. Sex in the few days before ovulation and on the day of ovulation gives the best chance. If your cycles are regular, ovulation predictor kits can help narrow the window.
Do Not Ignore The Male Side
It is easy to pin everything on the missing ovary. That can waste months. Male factor issues are common, and a semen test is often one of the fastest checks.
Ask About Reserve Testing If Age Is A Concern
AMH blood work and an ultrasound follicle count can give a rough sense of egg supply. They do not predict natural conception with perfect accuracy, though they can help shape the next step.
Move Sooner If You Have Red Flags
With one ovary, lost time can sting more if age is already part of the picture. If cycles are erratic or if you have a known pelvic problem, earlier testing often makes sense.
What This Means In Real Life
A woman with one ovary can get pregnant. Many do. Some conceive within months. Some need medication, tube testing, or IVF. The missing ovary matters, but it is only one piece.
The real question is whether the remaining ovary is healthy and whether the rest of the fertility system is still open for business. If periods are regular and the tube is open, natural conception may still happen. If there are added issues like endometriosis, blocked tubes, age-related egg loss, or sperm problems, the odds may drop and the timeline may need a faster plan.
That is why a one-ovary diagnosis should not be read as a yes-or-no verdict. It is a sign to look at the full picture.
References & Sources
- American College of Obstetricians and Gynecologists (ACOG).“The Menstrual Cycle: Menstruation, Ovulation, and How Pregnancy Occurs.”Explains ovulation, cycle timing, and how pregnancy begins after an egg is released.
- NHS.“Periods and Fertility in the Menstrual Cycle.”Sets out when ovulation happens and how sperm can survive long enough to fertilize an egg.
- Mayo Clinic.“Oophorectomy.”Defines removal of one ovary versus both and gives medical context for unilateral ovary removal.