Momamia, good luck! I hope it went well.
Sweetlily, so sorry you're in the same situation re: recent m/c. I think I remember that you're in Canada like me, but I didn't think they sold the curved handle type FRER here? I've used the straight handle FRER before and got a line on them with 7 HCG in my system confirmed by a blood test after my m/c. That line was faint but definitely pink, no squinting required. So when there's a greyish squinter on FRER my suspicion is under 7hcg, which could be either an early positive or false positive if you're actually under 5 HCG.