Period or implantation?

Okay so just more curious then anything. Me and Hubby are trying to get pregnant. I'm 26 he's 29. From 2-13 through the 16th we had sex. My period is suppose to go monday which would be 3-2. It seems I've been spotting since Monday. So Monday it was just light spotting Tuesday it was bleeding but it was still pretty like compare to my normally period. Wednesday (which was yesterday) it went back to spotting but more brownish red. And today nothing.

I guess my question is has anyone experience this before? What are your thoughts?