why is this happening?😳

Autumn
I felt a twinge of pain on the 26th so I thought maybe I was ovulating. I got a little bit of brown blood when I wiped on the 28th so I googled it and found out that u might get a little bit of blood during ovulation. But I've been getting some brown blood most times I wipe 28th, 29th, 30th, and today 31st and occasionally I get a little bit of a cramp feeling. 
Is this normal? It's exam period so I'm probably kinda stressed at the moment. But does stress affect ovulation and stuff?
The last time I had protected was on the 23rd and the 19th before that. But both times were protected.
Not sure what's happening?