So I’ll start by saying that I am very sure of when I ovulated (positive LH strip on the 14th day of my last cycle, pains the very next day, and only had sex ONCE during my fertile window). I should be 8w4d today, but at my ultrasound a week ago baby was measuring 5 days smaller. How is this possible? Has anyone had a similar experience and everything turned out okay? Baby DOES have a heartbeat.