Late Period...pregnancy, sickness, or anxiety?

My last period was about a month ago, June 14 or 16, I'm not really sure. My periods are never regular, they're usually a month apart or maybe a few days in between. I've missed a period in March, but I had it the following week. It was about two weeks late. Anyways, June 31st my boyfriend and I had some mutual masturbation (unprotected) although he didn't cum it was just precum. Anywhere from a half hour to hour after that, he rubbed me underneath my underwear but he never fingered me. I'm afraid some of the precum may have gotten into me. For about the past 2-3 weeks, I've been having stomach pains. My eating habits normally are weird, but I feel that they are even more abnormal. Normally before my period, I'll have clear discharge 2 weeks before, cramps the next week, and then my period. Well, 2 weeks ago I had a lot of discharge and then after a bunch of stomach pains. Only this time, it's not just cramps. I felt pressure in my left and right side by my hips, I also felt stomach pains where I felt nausea, or I felt kinda like mild stabbing pain. It moved all over though. Especially the last two weeks, I've really been stressing about these stomach pains and my stomach seems bloated and hard. I've had the pressure by my hips before, and it was pretty painful. My last period, I had spotting 3-4 days after and then this thick, milky-ish discharge right about the time I was with my boyfriend. Lastly, I haven't really been feeling the greatest lately. I usually get a cold around this time, a cough, lots of sneezing, and the sorts. I'm still a virgin, I've never had sex. I'm just really worried and scared to go to a doctor. Thank you so much.