Implantation bleeding

My husband and I have been TTC for about a year with no luck. This month we only had sex twice during my fertile window. The most fertile day being last Friday, the 15th. Today I had a bit of cramps but not terrible and had really thick creamy pink discharge which I've never had before. I'm not due for my period until the 1st. Could this be implantation bleeding? Or is it too early for that?