The chances of pregnancy usually depend on where you are in relation to your period. There is a high chance of getting pregnant if you've had unprotected sex either 3 days before or after ovulation. Though there are other factors that matter too, like the longevity of the sperm and it's not always certain that you would ovulate on the same particular day.
The only way to be certain of pregnancy is to do a urine test the day you miss your periods or after two weeks since the act.
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