Help! Pregnant?!

So I had unprotected sex for like 2 minutes June 15th. I'm on the pill, but freaked out so I took plan b right away. Then I had unprotected sex July 2nd, 3rd, and 4th. Freaked or again and took another plan be (I'm super paranoid 🙄). 
I got my "period" that month three days later than expected, but it was really light with dark red blood clots. 
July 15th through 17th I had unprotected sex and he pulled out or just didn't ejaculate. I'm not expecting my period for another two weeks, but should j be worried about a pregnancy? I take my pill correctly within a 15 minute window. 
I've been feeling light headed with lower abdominal pain, but I'm also taking Flagyl which has those side effects. My breasts have been sore but it could be because of plan B? 
I don't think I could be pregnant but I'd like some more opinions. Do you think the "period" I had really counted as a period?