Hi there and welcome. well, you can get pregnant at any time during your cycle when you have unprotected sex. You always put yourself at risk of pregnancy (and std's) when you do that.
Here is how a woman's cycle works though: Day one of your period is cycle day one. You count from there. the last day of your cycle is the day before your next period starts (determined by when you start). You ovulate midway through typically. For most women, then is about day 14 (ish) in their cycle. When trying to conceive, doctors tell women that you should have sex starting on cycle day 10, every other day until cycle day 20.
so, I'd say you had sex during the most fertile time frame 16 days before your expected period. But if you get your period, that's good news. right? good luck
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