Well...I have 3 experiences with this....(disclaimer- I am a POAs addict- I can give you "reviews" on just about every brand of test, along with pictures of ALL of my BFP's
1. The first time I had been taking HPT's every other day from 9 DPO on. They were all BFN's. By 18 DPO (my LP is 18 days, so I wasn't "late" by that point or anything) I got a BFP. It was SOOO faint. However, I think I can chalk that one up to the brand (FRE)...because in future pregnancies I used it again and my lines were ALWAYS faint. Anyway, I was pregnant...HPT's for the next few days confirmed that. Unfortunately, though, I miscarried that baby a little after 6 weeks.
2. The addict in my rose out again, and I started testing in the afternoon on 8 DPO. I could only see a shadow of a line, very similar to an evap. But you know how your eyes just *know* there's something there when you've been TTC for a long time? LOL It was a realy line, and day by day they got darker. But I miscarried that baby as well.
3. Once again, POAS addiction got the best of me. 9 DPO I did the same as the last time- afternoon BFP, but SO faint that no "normal" person would've known it was there. Now I'm holding my baby girl.
I guess my experiences may not be what you're looking for, since I have reasons they were so faint, like a crummy brand (I hate FRE) and SUPER early testing.