Different color blood meaning?

I was wondering if different blood color had different meaning?

Like I know period blood is usually dark and chunky sometimes (with clots and stuff) and spotting is old blood that came out with discharge naturally, but if its like, a bright red? Is that normal? I just had sex today after lile 2-3 months so Idk if its because of that cuz i started bleeding right after.

My periods are also irregular because I had the depo shot, and my most recent "period" just ended two days ago, so I'm wondering if this could be new blood or the same period that just "kickstarted" because of the sex?