Alright, I am the kinda person who worries about this stuff quite often so I need somebody to just help me out here!

I was on birth control for awhile but stopped in March (after I had my period that month, I did not begin it again). The following month my period came about a week early (April 10th), which was surprising but it was a normal period. I started again on May 10th...to the day which is very rare, and it was also normal. It is now June 17th and I have yet to start and I'm a little worried.

I am a virgin but I've fooled around a lot with my boyfriend. We are very careful about when he ejaculates to make sure my vagina is not really near his penis. And our bare genitals have never actually touched...only through our clothes! After he ejaculates though, usually in my hand, I immediately get a towel to wipe it off. Normally I'm just in my underwear while doing this and it is possible the towel my have come near my vagina or even barely touched it with the semen on it i just wiped off my hand. Not entirely sure though. Is there a pregnancy risk in this?? Also, my boyfriend and I were taking a shower together (in our bathing suits) and I gave him head..with my bathing suit still on. He cummed on my chest and I rinsed it off in the shower. Could it have rinsed down into my vagina and possibly gotten be pregnant?

I know these scenarios may seem a little ridiculous but I really need to know! I've never been this late for a period before. But I've had all my normal signs like moodiness, sore breasts and a little cramping..but I'm still worried. I also just moved home for the summer..so could moving and being away from my roommate (who my period synced up with because of how much we were together) change the timing of my period?? Someone please help ease my mind and tell me what I should do!!