Spotting after exercise?

Hi everyone,

So I am pretty unfit so thought I’d start working out regularly. I started yesterday and so far have done two 7-minute workouts followed by yoga. Yesterday I noticed my discharge was slightly brown but I didn’t think anything of it. This evening (I worked out this morning) I’ve had spotting to the point where I thought my period had come early (which it never does because I’m on the pill so am completely regular). Has anyone else experienced this? It’s the only thing I have done differently these past two days so I assume it’s down to exercise! It just shows how little I do it 😂