Dry sex = no period???

Taylor
Okay so my boyfriend and I are basically addicted to dry sex... And i have skipped TWO periods already... Thats 36 days late!!!! I've also been getting some back aches, feeling bloated and a little emotional. 
I know it's kind of dumb, but I'm just a tad worried. Maybe it's because I'm such a careful person... Also I'm on this water pill that's supposed to help with acne. They say that can possibly mess with  ur period. Like make your cramps and pms and stuff even worse. But I never thought the side effects could be this crazy... Also if i got pregnant on this and my baby was a boy, he could end up beimg a hermafrodite (or however they spell it) but anyways... Please help or tell me what i should do. Should my boyfriend and I get a pregnancy test...??