Ovulation predictor kits
These tests, which you can buy from pharmacies, give you a more accurate idea of when to expect your fertile days. They test your urine to measure luteinizing hormone (LH) levels, which go up in the 24 to 36 hours before your ovulation. When your LH levels are higher, you’re in the fertile window.
The kits contain enough test strips so you can check your LH levels several times during your menstrual cycle. Start testing a few days before you think you might ovulate, then repeat the operation a few times over the next few days to pinpoint the exact day. When the LH levels are highest, then you’re in the fertile window.
Progesterone ovulation tests
These tests let you know whether you have ovulated. They look at the levels of progesterone metabolite (pregnanediol glucuronide, or PdG) in the urine.
PdG levels typically rise 24-36 hours after ovulation, so the tests are very accurate. Start analyzing your levels before your anticipated menstrual cycle. These tests also contain several strips to allow you to check your progesterone levels throughout your cycle.
A twinge of pain
It’s possible to feel ovulate, but many women don’t feel it. You may notice a slight pain in your side about halfway through your menstrual cycle. But if you’re trying to become pregnant, don’t wait for the twinge. That means your fertile window will soon close.
When Does Ovulation Happen?
If your menstrual cycle lasts 28 days and your period shows up like clockwork, it’s likely that you’ll ovulate on the 14th day. That’s half your cycle. Your fertile window starts on the 10th day. You’re more likely to get pregnant if you have sex at least every two days between days 10 and 14 of a 28-day cycle.
How Long Does Ovulation Last?
Your fertile window usually lasts 4-5 days. These are the days leading up to ovulation.
Ask Your Doctor
Some women don’t ovulate on a fixed schedule. If you can’t figure out when it’s happening or if your menstrual cycle isn’t regular, ask your doctor for help.