I had a scan the other day, there was a gestation sac and yolk sac, she said my gestation sac was 9mm which would make me 6 weeks but there was no fetal pole. The women said that everything is looking good and I've to go back in 2 weeks, I am a bit concerned though as I thought you always see fetal pole at 6 weeks ? She said I could be anywhere between 5weeks and 3 days to 6 weeks and 3 days as anything this early in a pregnancy is really just a guess. I have really irregular periods with pcos and from working out dates I thought I would have been 5 weeks and 4 days on day of scan but I'm not sure why the sac would be measuring at 9mm? Sorry, hope this makes sense