Hello dr, my friend had unprotected sex with her partner on 9th dec and took ipill on the same day and got withdrawal bleeding on 18th december and on 25th december she beta hcg test which was 0.01 and after a month on 22th dec she got normal periods which was till 25th and was heavy she got normal periods but on 26th she got heavy abdomen pain as she had food from outside on 25th she took medicine but it still persist and it's mainly when she is having food did a stool test which indicated blood she also has pcos history, what could be the reason?