Too early ??? Implantation

I had my last period may 11 ( first day ended the 14th). Had sex Tuesday night no protection for hours BUT he couldn’t ejaculate. Today I am spotting and cramping. I have blood tinged CM. This isn’t normal for me and I am crampy. It feels kind of like my last pregnancy when I had implantation. Would this be too early for implantation?? Or could it just be a fluke? I know my chances are slim about getting pregnant because he couldn’t ejaculate but he had lots of precum . I feel like this may be too early. But I hadn’t had unprotected sex prior so if it’s implantation it would be from Tuesday. We are trying to TTC but we are older and ejaculation doesn’t always come easy for him .