I had an unprotected sex with my girlfriend and she took the "unwanted 72", i.e., emergency contraceptive pill. She is normal without any pregnancy symptoms but the problem now is that she has not had her period. It has been one and a half month since she took the pills and there is no period. She did the pregnancy tests four times and the results are still negative. What is the reason for her missed period and is she pregnant? Please give me the answer as soon as possible!