My periods were not regular because I had just gotten off Implanon 1.5 months before pregnancy. I had a period at the end of Feburary (I believe the 23rd was it's start date) and in March near the end I felt like I was about to start one and didn't and took a HPT on the 2nd of April and it was positive. I went to the doctor on the 7th of April and they placed my due date at November 30th due to period and they did a Ultra Sound. I had about 4 more Ultra Sounds before the doctor changed my due date to December 21st!! 3 Week difference! With my due date being so late, I don't see how in the world I had a positive HPT so early??? Was I even pregnant yet LOL?
Due Date Confusion- VERY FRUSTERATED
One of those online "conception date" calculators suggests that a due date of 12/21 means a conception date between 3/23 and 3/30. If it was closer to 3/23, then April 2 would be what, 9dpo? Definitely possible to get a BFP on 9dpo! Congratulations!
I had no idea I was pg with #1 until, as it turns out, I was already 6-odd weeks pregnant. Guesstimated by last period at the OB's office, and we were all shocked when the ultrasound revealed a fetus 4 weeks further along than we'd expected! He arrived 2 days after his ultrasound due date, btw.
But all this uncertainty should help you insist on some EDD wiggle room at the end, if baby turns out to be "late" and they start fretting...