Look, I am not trying to imply anyone is lying about seeing a second line, but the way in which a FRER works is very specific. It has antibodies to bhCG on the strip on the test line, and then a second layer of coloured antibodies to bhCG which attaches to the bhCG if present on the test line. You cannot get a false positive on a FRER or other reputable brand because of the immunology of how they work. That's all I am saying.
You can get false positives with ICs as they are generally made overseas with poor quality control, which can pick up LH as well as bhCG.
If you are convinced you had 5 positives with a FRER, did they get darker significantly with each day? Sounds more like a chemical pregnancy than a false positive.
I wish you all the luck in the world, but I think you deserve to know how specific FRERs and Pregnosis tests are. Antibodies to a substance are like a lock and key...they only fit each other.
Hope that helps.
If you are still not convinced, wait until 14-16DPO and do a ClearBlue Digital.