Hi doctor me and my girlfriend had sex on 2nd March which was the seventh day of her period , we had unprotected sex for a minute of so and then we did use the protection , afterwards my girlfriend took an ipill within an hour or so , now her period date was 26 March  (her usual cycle is 25 days ) but there is no period yet also we had sex on 25th of March and again she took an ipill just a day before her periods were due , it's 31st today and no sign of period . Please help worried like he'll.