We had an unprotected sex for the first time with my partner on the 6th day of her period just for 40 seconds maybe. there was no semen as well as no pre-cum as i was concerned. Suppose if there was any pre-cum And just after 40 seconds she started bleeding and i pulled my penis out. after the incident we did't do anything else. and after 47/48 hours of that incident she took two contraceptive pills( 1 white, 1 yellow). But just after one week of that incident her period started yesterday and continuing. normally Her periods are regular (25-26). but this time just one week gap!! So what are the problems? And is there any chance of pregnancy?