Dating the pregnancy whose right ?

[Pcosfighter67]

So I am 13DP3DT in my working out that makes me 4 weeks and 2 days pregnant but the nurse at the clinic said I was wrong and I'm 4 weeks today. That doesn't add up to me and all the IVF due date calculators which take in consideration the transfer etc are all saying the same as me.
What's everyone else's thoughts?

I had the same situation, my OTD was 13dpt (it was a Tuesday) and the nurse classed that as me being 4 weeks, however the calculators were saying it was 4 weeks on the Sunday so 2 days before.

I never really got to the bottom of it but when I had my scan at 7 weeks I was measuring a day ahead and my due date was given then so I don’t think it matters too much at this stage but I’d say you’re right.

Honestly it doesn't really matter at this stage. They will date the pregnancy at your 12w scan based on their measurements and this will give your due date x

They don’t care about ovulation date, they assume due date from last period.
when you go to your dating scan around 12 weeks they will then re-date the pregnancy. Due dates are crap anyway it should be a due period of about 5 weeks!