BFP - What does CM look like before a BFP?

So I'm due a visit from AF in 5 days time. according to this app I ovulated on 31st July. We BD 3 times in the 4days leading up to that date and 1 time after. I felt cramping on 6/7DPO depending on if Glow was right or not but my CM is minimal right now. If I were to be BFP, what is the CM usually supposed to be like? Any ideas