implantation or period?

None of you are doctors but I thought someone may know. 
I ovulated 4 days ago. Confirmed with ovulation tests. Today and yesterday ive been having cramps and today when i wiped there was very light pink spotting. Ive heard this could be implantation? 
My period isnt due for over a week. We havent had sex since ovulation so its not from that, nor have i been doing anything to strain my body. 
We only had sex 2 days before ovulation and the day of.  Help!