Due date?

Congratulations everyone!

I'm just wondering if Ive estimated my due date right. I know my doctor will tell me at my first scan but I'd like to know how far along I am now because it's all new and exciting.

My last period was 2nd August, which gives me a 9th May due date whereas if I count from my VERY LATE ovulation I get a due date of 3rd June!!

I wonder if doctors do count from conception rather than LMPs in longer cycles. All very confusing! I'm too impatient to wait and see as I know I won't get to see doctor for a few weeks yet.

Thanks in advance - curious to know how you have chosen your estimated due date prior to an appointment with doctor x