Hi My Name Is Ashley And I Have A Serious

hi my name is Ashley and I have a serious question . I currently had protected sex last week . I currently was on the birth control pill and my doctor told me do not have sex the first month on the pill and I did complete opposite so my bf admitted to cumming in me , and lately my body and stomach and head has completely been changing do you have any answers for me like can i possibly be pregnant and when should I take a test