Should I worry about being pregnant?

Yesterday, my boyfriend and I engaged in unprotected sex for the first time in a few months, and I noticed a few weird things about my vaginal area when we were finished, for one my cervix was open (as usual during ovulation) because it was incredibly easy for my boyfriend to penetrate, secondly, he got his "stuff" on my bed, He tried to say it was all me because he got scared, but I've got some strong intuition that it wasn't because I got that slimy, sticky feeling you get when a guy ejaculates into you and some of it got on my bed, and I spotted it because my sheets are dark, and thirdly I tried to eat sushi (with cooked fish) and cooked shrimp (both are my favorite foods) and they repulsed me to the point where I vomited them up before I could even fully digest them, this had me worried because I've never had this problem with any of my periods before hand, I usually crave those and chocolate or anything sweet like crazy, and this month, all I can do is be repulsed by the idea of even TRYING to eat anything I usually crave...so should I worry a little?