Could unprotected anal sex without ejaculation on the 2nd day of menstruation cause pregnancy?

I had vaginal intercourse on april 24th with a condom in which the guy did not ejaculate.3 days later i got my period.on the 2nd day of this period i had anal sex in which the guy did not ejaculate.my NEXT period was lighter than usual,it was 5 days late,started off light, then the flow increased.i filled about 3 pads on day 2 and 3 and two liners the last day.the bleeding lasted 4 days and was bright red and more abundant when i wiped then on the pad.ive taken 4 first response hpts,all negative(2 of the test were taken 6 weeks after the anal sex occured).its been 11 weeks since any sexual encounter, ive had no nausea or sore breasts.could i still be pregnant?does the bleeding i described seem like a period?