Three evaps and then negatives would also say chemical to me. I had three chemicals and they were all similar in nature. It would very unusual to have three evaps, from two different tests. And in all the tests I have taken (a LOT!) I have never gotten an evap from a FRER. I know some ladies had issues for a while, but they are generally more dependable.
I am sorry you got your hopes up. Hopefully you will get a nice birthday present (two weeks is good timing

) and get to have that bebe before you turn 41

Hoping a BFP shows up very soon!