COULD I BE PREGNANT????

Hi guys! I've had this app for a while; but im in a prediciment!! I need opinions bc im about to freak out! Me & my boyfriend have sex probably 3-4 times a week & he usually busts in my butt which sounds weird to say here but whatever. Anyways, I aleays run to the bathroom after to let the cum run out & clean myself up. Im always careful even though I know that the sperm can only last so long & so on; but i've heard of it dripping from the butthole to the vagina so ya know. But again anyways; I had my period the first week of April, & last week on Thursday; I thought I had started my period again which I thought was strange, but i popped a tampon in & went about my day. It stopped completely by the end  of the night. Could I be pregnant?? My boyfriend is supposed to be getting me a test tomorrow so I can take it; but i honestly have a gut feeling I am. PLEASE HELP!!