hi, i had sex with my girlfriend on 19 jan. 2011. after that she had periods on 30 jan to 2 feb. now till today her periods does not came. is there any chances of pregnency? why periods of feb. month not came yet?(it would be come on 1 march but why did not came?) please help me ..... today is 11 march, but still she have no periods. sometimes she feels like period will come but sometimes she feel normal. we dont know what is happening plz help us. she is under pressure n i am now in bangalore .i m not able to with her. plz any dr. clarify us. n febuary was there which had only 28 days , so keep this in mind tell me is there any chance of pregnency?