What are the chances of getting pregnant when ovulation is expected?

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Okay, here’s the thing. It was my first time ever and I’m not sure about my menstrual cycle, but if you base it on the average which is 28 days, it says that I was fertile and ovulating on the day of sexual contact. No protection (and please don’t lecture me about this, it’s not part of my question). I just want to know what are the chances of me getting pregnant, and is it possible that I may be conceiving already? What’s the shortest time for me to wait until I would know for sure if there’s really another life inside me? Please state as much details as you can. Thanks and much appreciated.

Healthy couples with no fertility issues where the woman is under 35 have about a 25% chance of getting pregnant each month. Still, if you’re unsure of your cycle, you need to remember that you don’t know when you ovulate, and that sperm can live in your reproductive tract for up to 5 days if the conditions are ideal (which happens when you’re near ovulation.) If you’re not trying to get pregnant, choosing a reliable form of contraception would be smart.
If you know when you ovulated, wait about 14 days after ovulation to take a pregnancy test, or around the time you expect your period. If you’re not sure when you ovulated or when your period is due, wait about 19 days after you last had unprotected sex to take a pregnancy test.
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