Had intercourse on 4th may without any protection . I didn't cum inside ( might be pre-cum) it was her second last day and the next day she had normal period flow too i.e last day of her and within 1-2 hours of intercourse she had an  i-pill and after 2-4 days she had brown bleeding(very light flow ) for a day. then nothing happened now she's getting cramps ( like pre periods cramps ) is she pregnant. Should I be worried ? When she can expect her next period