Scared out of my mind

Okay so this is going to be a little long but I really need help. So I am 18 and I've Been starting to get sexually active. So in May me and my boyfriend had sex twice but once was unprotected. I was so worried and scared cause my period ended up being late. So I waited a couple weeks and took a pregnancy test. It came out negative. I then got my period a couple days after and have continued to get my period. Now it's three months later and the whole three months my stomach has been feeling hard. I don't know if I never noticed but stomach just feels bloated and hard these past few months. I haven't gained any weight if anything I lost weight but my stomach just looks bloated to me. But the thing is we just had sex again last Friday and it was protected and I bled A few minutes later while we were having sex. I did continue to bled for a day or two but it was very very little. So I washed off and everything but my period was due the following Monday and I have yet to get it. I don't know if it's cause I'm stressing about so many things or what but I just need opinions and thoughts on what to do and how to calm down.😫