question: Hi,i m confused my periods came on 11th July 2010,i had unprotected sex on the 18th July and on 24th July a condom was used but broke so i took Postinor 2 and started bleeding on the 25th-27th July. I again had sex on 1st August and i m now pregnant but not sure when it happened. Please help. Did an ultrasound on 22nd September 2010 and my due date was 1st May 2011 but i also told the doctor that my LMP was 25th July because thats the last time i saw blood.