Most people get a +HPT with the sensitive tests at 13DPO. I have being through hundreds in the past year literally as I have gotton BFP on three occasions and then test worse then ever to see what the line was doing. I found the internet cheapies the way to go although never completely trusted them when I got a BFP on them until another test told me otherwise. They were fairly reliable however and I could but 50 for $20 or there abouts.

I was losing my mind every month also (am I aren't I) and now still am and I am not ttc anymore for the time being.

Goodluck I hope it shows a BFP.