Implantation bleeding or AF coming? Need opinions!!

I ovulated last Friday, the 1st. Last night and today I've had a little brown spotting, only when I wipe. SO and I did the deed last night, and I bled a little bit more after that but it's back to nothing now. Before the spotting it was a lot of super watery CM. Like enough to make me think I started. No cramps, boobs are hurting, super tired. AF is 4 days late. Any opinions? And yes I've taken tests, there was either a faint line or an evap on the one yesterday, but nothing that I'm calling a definite positive.