Late implantation?

[MummaSue]

Hey guys, anyone know how late implantation can happen?

I am 13DP-IUI and had one spot of mucus-y blood on the TP yesterday morning. Nothing since, just the (TMI) creamy CM.

Could that have been implantation spotting?

I'm getting cramps and very mild bb tenderness. Am trying not to get my hopes up though, don't want to be disappointed again.

Thanks lovelies!
Sue xxxx