ovulation? implantation bleeding? or just spotting?

Autumn
Last period started : 13 March
Next period expected : 12 April
.
According to Clue, I should have ovulated around 29/30 March, and I did feel cramps and a bit of pain on the 30th. My boyfriend and I had protected on the 29th. And I've been seeing some dark reddish-brown blood when I wipe sometimes, not every time, on 31st and 1st and today is the 2nd (since some of us are in different time zones haha). 
I'm just a little worried about whether this is blood from ovulation? Or could it be implantation bleeding? Or normal spotting? Or could my period be starting early? Thank you!!! 🙏🙏🙏