Looking for hope

Rachel

So according to this app I am 13 dpo but I should’ve started af yesterday. I took a frer because I’m usually never late. It I took it stupidly thinking if I was pregnant it would be a BFP. With my 2 living children (multiple mc’s and 1 missed mc) I got super positives before af was due. ANYWAY so I took it in the afternoon and I hadn’t been holding my pee. Well it was negative. Still no af today and really no normal symptoms of it coming. Maybe I ovulated a day or two late? Or maybe it implanted late? Anyone get negatives until like 14 or 15 dpo and finally get a bfp?