FRER progression line ?

Okay mommas! I’m using FRER and I can’t remember if this happened w my daughter! Basically.. I tested early. I’m doing that now and I got a white line immediately where the dye would be pink for the test line (before the always pink line).. did y’all’s do this and then just boom turn pink when the HCG was high enough? Trying so hard to remember with my daughter but I can’t. 🙄🙄