Help!!

Okay so please tell me I’m just being dramatic! The last time I had sex was September 8th and I’ve gotten my period every month since. Well, the last couple of days my stomach has swollen (I’ve always been naturally slim and I workout a lot so this is out of the ordinary) and I’ve had the worst stomach pains. I feel my stomach constantly pulsing. Should I take a pregnancy test or is it something (or nothing) else to worry about??