Gestational age vs other

@GPSJane – was your cycle regular and do you have a definite idea of when you conceived? You might have ovulated a little later than expected, how long into your cycle did you find out you were expecting? My periods were irregular, but the cycle in which I fell pregnant was a perfect 28 days and I only know that because I found out at 4 weeks, 1 day LMP.

There are sometimes 2 weeks difference with U/S measurements, but I think that it's sometimes more in later stages where it's normal because babies grow differently. I could easily be wrong.

Oh yes 22 April. Wow all this time and I had no idea!

Surely you mean April 22nd?

I went for my 1st scan and according to that I am 6 weeks 3 days but according to dates I am 7 weeks. I think it really would depend on when you ovulated. Also the embryo is so small now that if the cursor points are even fractionally off it can make a huge difference in gestational age.

I am a bit confused; I calculated my pregnancy times from my last menstrual date before having a scan. I then had a scan and the sonographer measured the CRL ad gave me a different date. The difference was just about 2 weeks so I assumed this was the difference between menstuation and fertilisation, only now I'm not so sure.

The complicate things, I don't have an exact date for my period but I do know it was just ending on a specific date when I went to the emergency room and was asked if I was pregnant before receiving an injection.

So the dates are;
Last menstruation - 22 May
(Based on end of menstruation being 26 May)

Therefore on 20 June I should have been about 9 weeks and 3 days.
But she measured 7 weeks and then when she measured again 7 weeks and 6 days.

I just want to make sure this is the age I use when making my 12 week appointment as this is apparently quite important for the tests. And also, why such a big difference?

The 2 ways of measuring confuse me and now I don't know if she gave me gestational age (and which one is that by the way?) or something different.