Spotting since ovulation - has this happened to you?

[babyjno1]

This is our 2nd month TTC, so I'm still new to all of this. To start, my cycles are usually 29-31 days. I used a digital OPK this month and never got a positive, but I think I ovulated on Thursday (CD19) - I had lots of EWCM, bloating, and sharp pains on my right side. DH and I BDed on Wed AM, I had some light pink spotting a few hours later. On Thursday PM we BDed again, it was a bit painful, and I had more pink spotting mixed with CM. Since then, I've had tiny amounts of brown spotting and no CM. Today is CD22, so I have about a week before AF is due. Has anyone experienced similar symptoms or have thoughts on what the spotting could be? I don't want to stress myself out, but I hate not knowing what's going on!