I have unprotected sex with my wife 19 feb 2015. She had taken I pill(plan b) within 30 min. Her last period was 10 th feb she has got her period 14 th march which was 4 days late. It was lasts 3 days again she got her period 21st march which was lasts for 6 hrs but her 2nd period is missed due for 7 days she has taken 2 pregnancy test which came out negative. We are very scared is she pregnant? please help dr we are very scared. We did not made any sexual contact after 20th feb.