Is it periods? Can she be pregnant?

It was 13day of her cycle(last time it was 28days cycle its irregular when she is stressed)...we were foreplaying(still virgin)...my penis tip touched/ rubbed her vaginal opening but didn't insert...she was wet...and maybe there was some precum on my penis(i peed atleast 2 times before this)there was no prenatation...we panicked and she took an ipill on the same day just 4-5hrs later...there was happening pain on her abdominal in first 3-4 days but now its fine(the contact happened on 30th oct today its 6nov) and today she started to bleed and said that its just like her period the flow is strong with cramps If we look at with 28th cycle the periods should come on 13-14nov Please tell me what could be the reason? Is there any chance of getting pregnant after all this