Could I Be Pregnant? all this research has me confused

Ok so my last period was on the 18th of April and lasted for a week as always. On the 3rd of May my boyfriend came over and we played around with each other and he ended up fingering me however before that he went to another location in my house for like a minute and I called him and ask what he was doing and he told me he didn't want me see him doing "The One Man Show" (masturbating). Two days after this all happened I started getting paranoid and so I asked him if he actually did touch himself and he told me no but I feel like he did. I was due for my period the 18th of May but I'm 2 days late. I'm assuming I'm on a 30 day cycle because before this incident I never really monitored my periods. I know for sure I'm not on a 28 day cycle and I'm more convinced I'm a 30 but not 100% about that. Ever since that day I've been feeling guilty, wishing it never happened and stressing a lot about it. I've researched my problem and I wasn't having any symptoms (no brown/pink discharge, no spotting, no bloating or constipation in fact I've been more regular lately). However earlier this week my breast started feeling sore around the nipple area, I've been having headaches and I've been having cramps and side pain but I usually have these around my period time which is suppose to be now. I'm getting really scared all this research has me confused and idk what to think. I'm just graduating High School I don't want to be Pregnant please help!