Is my body punishing me???

[Donch03]

I’m trying to conceive #3. Have been trying on and off for 2 years but been tracking my cycles this last year and using apps to predict my ovulation. Not had 1 BFP. No reported fertility problems have always fallen pregnant quickly in the past. My cycles are regular, 27 days. AF is 2 days late, I’m CD 29. I took a FRER on CD27 13dpo and was BFN. Had some clear discharge that day and also yesterday which is quite unusual for me. Why is body doing this? It’s unlikely I’m pregnant as we only dtd once on ovulation day!! I feel so disheartened and upset.