Cycle day 32 still getting negatives (TMI no picture)

Alexandria
I've taken a million and 1 tests and they have all been negative! 
​It's driving me insane. 
​I've had a constant headache for the last 3 days, flutters in my stomach, right side pains in my abdomen, intense smells with some perfumes and food, gassy (TMI) and no spotting or anything to suggest AF is coming for a visit. 
​My CM isn't in abundance but it's like glue. Like liquid Elmer's glue. (TMI, again!) My Ovia app says that could be a sign of conception but who knows! 
​Anyone have any advice?