I had unprotected sex with my bf over a month ago but he didn't ejaculate and it didn't last long at all because we didn't want to risk it anymore and about 2 weeks after I had my period and it last like 4 days which is a little shorter than I normally have but the period flow was normal until the last day which is also normal for me. so I figured I wasn't pregnant. But I usually start my period towards the end of the month (like in the early 20s) and I still haven't had my period this month. So could I still possibly be pregnant or could it just be from stress? because I don't have any pregnancy signs but the late or missed period.