could I be pregnant?

my boyfriend and i have been having unprotected sex everyday for the past few weeks and recently I started to vomit at random times throughout the day, I have to pee constantly, I also get the wrost stomach pains and cramps im the lower part of my stomach, im extermly tried and my breat are sore.. I havent missed my period yet, but these systems started right after my last period and havent stopped. should I buy a pregnancy test now even though I havent missed a period?