2 weeks after sex (Condom only)

Hello Im scared on dec. 7 me and my bf have sex and we only use condom, dec. 9 I got my period which is heavy (cloth blood) for 5 or 6 days then dec. 22 I experience feeling bloating and feeling vomit, now dec. 26 I had back pain, I dont know if Im pregnant or not, can somebody help me. Thank you. (My 1st sex)