ClearBlue BFP and First Reaponse negative 15dpo

Markayla

So I peaked on Dec 4th i did test to know. Ik 15 Dpo is late and I should already get a clear positive, right? I’m not quite sure when my period is supposed to start or if I already missed it. But I took a clearblue bluedye and a first response at the same time. Late evening. Any thoughts or do you think the clearblue is negative?! Has anyone got there first postive later on and it was a successful turn out?!