Worrying about being pregnant

Ok so I'm 16 and after I broke up with my boyfriend I went a little slut mode. Well let me start from the top... I cheated on my boyfriend and had sex with a guy while I was drunk at a party. The next morning I got plan b to be safe. A couple days later I got a normal pretty heavy period. Once this period was over I broke up with my boyfriend and then that night I had sex with this guy (let's call him guy M) we went at it twice but were drunk. We know we used a condom but we were just worried because we don't know if it stayed in tact. I didn't get plan be the morning after. The next night I went to another party and went home with another guy (let's call him guy C) and we used a condom but he didn't cum so I wasn't worried. The next night I had sex with this other guy, (let's call him guy L) and we broke 5 condoms but then he cummed on his chest so I wasn't worried about that. The next day I was freaking about Guy M because we still didn't know if the condom broke or not but we didn't think so, so I took plan b but it was 3 days later than we had sex. It says up to 72 hours but I'm hoping it worked. It's been a couple days and I have not gotten my period yet and last time it made me get it... Should I be worried!? Also if I don't get it in 2 weeks should I take a pregnancy test?  If it comes out positive does woman's clinics give abortion pills for free? Because I don't want my parents to find out. Please any advice???