Confusion about FRER

Why would I get a faint, but clear, positive on a dollar store hpt but barely any second line on a FRER?

I have taken 3 dollar store HPTs the past two days and they are positive. I have also taken 2 FRER (one with FMU) and they could easily pass as negative because it took about 5-6 minutes for barely barely anything to show - and of course at the 10 min mark, and when they are dry, you can see a faint pink line (and also when held up into the light)

I’m so confused. Has this happened to anyone? I’m 2 days passed expected AF and with my first pregnancy I got blazing positives 3 days before AF on a FRER.

Can anyone shed some light??

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors