Why Won't This Work?

I’ve been sick as a dog the past few days, migraines, nausea, feeling generally like shit.  I don’t usually get migraines anymore (ever since I had my surgery) so it’s been strange.  Then yesterday my temperature plummeted. And today it plummeted again. I tested 13dpo and haven’t since, with the temp drops.  AF is due tomorrow and no doubt will be here right on schedule. Another month down the drain.

I am seriously getting panicked.  There is nothing “wrong” and yet even with IUI we can’t get pregnant? What the eff is going on here?  Something HAS to be wrong.