12 dpo bfn and feeling down

Ka
This morning (12dpo) brought yet another bfn. AF due Thursday and I'm feeling out. :(
So, it's officially been a year since we began ttc our first (my second), and after months of charting with normal cycles (save some pre AF spotting that my doc claims is totally normal), tests (me and the hubs) all of which were normal, a secondary infertility diagnosis, and an insane number of bfn tests, I'm at a loss. It's so frustrating not knowing why we aren't getting pregnant!
We have been using preseed for 3 cycles  and this month progesterone suppositories (my doctor did not think that was an issue, as my 21 day test was 14.6, but humored me due to my weird consistent spotting pre AF and desperation) but still no BFP.
I will be 32 this year and we still want 2 more, but at this point I'm almost ready to throw in the towel. 
Anyone have any advice or in the same boat? I swear everyone around me is getting pregnant and asking when we are going to be. 😥