Spotting after exercise every day this week?

So I've worked out three days this week on days 17, 19, and 21 of my cycle (usually 29-30 days), and after every workout I've wiped and found a lot of cloudy egg white CM with small traces of red, stringy, and somewhat clotted blood. I've done a bit of research and found that it could be breakthrough bleeding (I did just start a new, harder phase of my workout plan this week, so I've been working harder), but I wanted to see if this has happened to anyone else and to get other opinions. Other than this I feel completely normal, no weird symptoms or anything like that. Could this potentially be implantation bleeding or am I crazy?