Hook Effect / Prozone Phenomenon - any experience?

I’m 5w+1d and received a very faint positive using FMU on a FRER this morning (see below). The last time I tested was around 4w+3d using FMU on a FRER and received a BFP (see below). However, none of my tests have been so dark that they stole ink from the control line.

*I’m currently taking progesterone and Lovenox (history of miscarriage and clotting issues). I am wondering if I am miscarrying and the progesterone is masking the miscarriage.

Anyone have any experience? I’m going crazy because it’s Saturday and I cannot call my doctor.

FRER at 4w+3d

FRER this morning at 5w+1d