Confused!!

Kristen
So last month during my "fertile period" I spotted for like 3 or 4 days. Ok, I figured probably ovulation spotting so my hubs and I had sex a few times during. Two weeks later when AF was supposed to arrive, nothing. AF was due to show 2 weeks ago and I still have no period. However, today I began spotting. Mostly looking like brownish discharge but then there was a tiny bit left in my undies. I have had 4 negative pregnancy tests in the last 2 weeks, and I am bloated! However, I have Hashimoto's and recently went on a new med. I think my lack of AF could be because of this. However a little part of me is hoping that I have just been testing a bit early.....what are your thoughts??? Preggo or thyroid med causing AF to not show???? I'm super annoyed by it and wondering what is happening to my body!!!!