I am so annoyed at my clinic - I was told I was 4 weeks last Monday.

The 1st day of my last period was the 13th of August, EPU was the 28th of august and transfer was the 31st of august.

NOW.. this is where it gets confusing, I think that I am 5 weeks 4 days today - using the 1st day of my last period.

The nurse at the clinic says they use the day of transfer or "conception date" which means I am 5 weeks exactly today and due on the 24th of May not the 20th of May!

Do they use this date because they know exactly when conception is???

How does your clinic pick your date??
Conception date would be the best way to go, as some ppl ovulate early or late after their period, but transfer is ALWAYS 3 or 5 days (depending on what type you had) past conception date, conception date being your EPU.

I had an FET, and that was 5 days after my ovulation date so my clinic uses that one.

But don't put too much emphasis on it, each time you go for a scan you can be given different dates too. Just go off your conception date since that's the only concrete date you have At the end of the day your little bubba is going to come whenever he or she is ready, regardless of what date you give it!