Am I pregnant or just having pre period symptoms? 😳

So lately I've been feeling very bloated and heavy in my bladder/uterus region and it feels as though I have a full bladder yet I don't have the urge to pee. I've been feeling very tired lately also and have been eating a lot (although I usually get this way before me period). I have had unprotected sex but am on the pill, and I'm a little paranoid that I may be pregnant. I don't start my period until the 21st (according to eve) so I'm not sure whether I should wait to see if I miss my period or take a test ASAP. Question is, are these PMS symptoms or is there a possibility that I am pregnant?