When should I take a test??

Hey y’all, so my period is a normal 28 day cycle, and I’m on the pill. Usually a week before my period I’ll get the PMS symptoms for a day or two. I’m supposed to get my period next week, and right now my breasts have been super sore for about 3/4 days, when they usually only hurt for one day. And this is gross but I was eating today and I like threw up in my mouth a little and was nauseous afterwards. I’ve had sex without a condom, but it was for like literally 2 minutes and then he went to put a condom on for the rest of it. I’m kind of nervous about being pregnant from precum, even though it’s a small chance because of the pill. But should I take a test after my period is late?? And if I was pregnant, would it still be too early for those symptoms??