My last period was around the 23 of last month. had sex 2 times on the 2nd or 3rd. ive had unprotected sex 3 other times and got pregnant twice. odds?

Roundabout 10%: On average, a fertile woman who has unprotected sex once during a fertile time in her cycle has about a 6 - 8% chance of becoming pregnant. This doesn't double with two episodes of sex but does go up a bit and eventually plateaus. If you're tracking ovulation and happen to have sex on just the right (or wrong) day, chances can be as high as 30% with a single encounter.