Please don't judge me because I know how judgy you all can be on here but I'm confused and I trust this community because majority is kind. But my LMP was March 1-5 on the last day of my period me and my guy had unprotected sex on March 5th and the 6th and sometimes later in the week. Well some things happened we broke it off and I hooked up with my ex later that month on the 21st. My period was due on the 30th and it never came I thought it was just going to be late so on April 6 I took a test and that night confirmed a positive at the ER. Now according to my last month period I would be 15 weeks 1 day wit due date of 12/6 but according to ultrasound I'm 13w5days and due date is 12/13 with possible ovulation being the 12/15. My first week of being pregnant started on the 15th is there anyway I can calculate this correctly? I told both guys so they are aware I just want to know if I can calculate exactly.