I had sex with my girlfriend on 17th April when she was on her period but the condom broke.She took Unwanted72 right away and she got spottings around 5days later.Her period was due around16th May however till date(2ndJune) she hasnt got her period yet.She has taken two pregnancy tests but both shows negative.What might be the reason for this and is it some serious side effect of the pill or is there a chance she could still be
pregnant?