Implantation???

I’m mid cycle, according to glow I’m meant to be ovulating but I’m spotting brown.

I’ve had unprotected sex nearly three times a week since my last period (2 weeks ago) so 6-8 times. No pull out either. I’m on cycle day 16 and this is the first day of spotting.

I’ve had cramps, and I don’t see the blood unless I wipe after going to the toilet (TMI sorry)

My opk’s are negative, like.. barely there.. so either I’ve ovulated already which is possible or I dunno help!