Went in for my 14 week appointment today. It was just a check up, but they measured me with a tape measure thing & said I was measuring 13 weeks. Also got to hear the baby's heartbeat which is 158. Is it ok to be measuring a week behind? When I went in for my 11 week ultrasound I was measuring right on time. The doctor didn't seem worried, but I just wanted to make sure everything is ok.