Earliest implication bleeding?

Okay. My fiancé and I BD on the 27th (last Sunday). I wasn't exactly ovulating then, I only had about a 7.6% chance of getting pregnant, then the next time was that Wednesday with an 11% chance. The time after that was Saturday eaaarllllyy morning, twice actually, once a little after midnight and then the second time around 2:30 that morning (uhh. I woke up randomly in the mood, gave him a kiss and planned on going back to bed, but it escalated very quickly from there.). I went to check my CM just a little bit ago, and there was a very, very slight color distortion. Like there was a small trace of blood. But nothing on my panties or anything. Could it be implination bleeding? Or could I just be getting my hopes up and seeing things?