Mid cycle spotting?

Erin
This is month #1 TTC. Off BCP for 1 year with cycles averaging from 32-34 days. Last month, not TTC, I stArted spotting for the first time ever at CD 26-31 and got AF on CD 32. 
This month, TTC, I started spotting yesterday and still today and it's CD 24. Brownish in color and only when using the restroom on tissue with mild cramping and low back ache (like with AF)  I am temping and looks as though I did ovulate and temps are still Up. No major signs of pregnancy. I'm tired but also have a cold. I know it's too soon but HPT was negative today. Trying to understand by body. 
​What do you think is going on?