So last week we had our first appt. Counting from the first day of my last period baby should have been around 7w 2d but he measured at 6w 1d with a heart rate of 116. Dr said i probably ovulated late and heart beat was low but that was normal since it had probably only been beating for acouple of days. Has this happened to anybody? Had a mc last year and im super uneasy... Pls advise!