A little over a week ago I had unprotected sex both anal and vaginal. He came in my anus. I am not on birth control. It is close to time for me to have my period. We did this on the 3rd of July and on the 11th I had slight bleeding. Not really a period and it was dark blood. Well today it seems like it has stopped. It tappered off into a brownish pinkish discharge. I have no cramping nothing except for my lower back and hips aching. Could I be pregnant?

{EDIT} Ok I just checked my tampon because I was feeling a little wetness and it had reddish pink blood on it. A little more than there has been.