Same dpo every bfp?

[Cienega]

I've had 4 pregnancies, my first three were not entirely planned but very welcomed, as a result of not planning I never knew exactly what dpo I was when I tested but I remember two of them It was a couple of days before my period I think 🤔
My past pregnancy (ended in mc) was planned and I got a bfp on 9dpo. I am 9dpo again now and just got a bfn. Due AF in 3 days. I'm thinking I'm out because that's when I had my positive last time.... Did you all get bfps around the same dpo in your pregnancies? Curious to know, anything to make me think I'm in with a chance still!!

It's completely random each time :) All has to do with how long it takes for the egg to travel down and implant - that's not going to be the same every month.

I read an interesting article about how the DPO a pregnancy is detected depends also on your base line HTC, so if your base line is 3, and you implant on 8DPO then on day 9DPO it will be 6, and 10DPO it will be 12 etc (it doubles every day or so)... But if your base line HTC is 1, and you implant on 8DPO, then on 9DPO it will be 2, and it will be 4 on 10DPO, and wont be detectable by a pregnancy test until much later. Other variables include the test sensitivities etc.

SO... it could be a completely different day from one pregnancy to another!