SPOTTING ON THE PILL?

Hi ladies,

I've been on the pill for almost a year now, no problems. I am 5 days into my ovulation week, and the day before my ovulation week I had unprotected sex. Today, I had pink CM. Should I be worried? or is it too soon for implantation bleeding? if not, is it normal for some pink CM during ovulation? I've never had it before.