Calculating due date with irregular cycles?

Jessica

Is it even worth going through the hassle?!? I keep trying to figure it out because I can’t wait wait until my appointment - three more weeks! Ugh!! My last period was January 4th but we didn’t start actively trying until February! I have no idea when I ovulated.

I tested February 21st and got a BFN. I got my BFP on March 3rd - a week and three days later.

Anyone have any tips on how to try to calculate this??? I also read online that it’s likely you are already 4-5 weeks pregnant by the time you get a BFP, is that accurate? Thanks in advance!!