Never had a BFP before 15 DPO....

Candi • Baby one born March 2016! Was TTC for 20 months. Baby 2 born 6/2019. TTC for 20 months. Now TTC baby #3. Scar on my tummy is from surgery I had as a baby.

So I'm wondering about this.....I have two children. My daughter took 22 months to conceive, I got a negative test 15 DPO and then a positive two days later when pregnant with her. With my son, who also took 22 months of ttc, I got my positive on day 15 DPO as well....is it just me....I've tested so far this cycle and have gotten negatives. I'm 12 dpo right now.

Cycle with my daughter's positive in 2016, I don't know why it doesn't have my ovulation marked.

Positive with my son in 2018. I clearly, barely tracked this month but can't remember why.

I am on Letrozole and progesterone.

I was on clomid and progesterone to try to conceive our son but wasn't able to take either the month we conceived him.

Was only on clomid when conceiving our daughter.

What I'm wondering is if it's possible to get a positive so far past ovulation after negatives? Could I just not have enough hcg or babies implant late? Or both coincidental and I'm not pregnant?