my last date was on 1st January but before that there was little bleeding on 26 Dec it remained for two days after a week complete bleeding was there on 1st January now in Feb there was spotting on 3 rd Feb but no proper bleeding then again on 14 Feb spotting was there but no bleeding i went for pregnancy test and all the test were positive i went to my gync she told that there are twins but she can't be sure whether pregnancy would continue or not week after there was high bleeding my gync did a ultrasound and my one twin was no more but another twin was growing gud and another week there was heart beat in my child and then doctors told me that my due as per baby growth is 18th Jan not 1st Jan i m not able to understand why there is a gap of 18 days..... pls help