Do FRER tests take a long time to darken?

Fab 🧿

I’ve been testing with both FRER tests and cheapies. Cheapies look like they’re progressing but FRER seems to be stuck in one place (if not even a little lighter this morning)? The older ones are yellowing so it’s hard to see them.

Love to hear your thoughts!

The flip side if that my pregnancy may just not be progressing. I’ve had my bet done yesterday at 8 days past FET and it was an HCG of only 52.