Am I starting my period or what?

My first date of my last period was on Oct 3rd. I’ve been having intercourse with my SO, every other day after my period, some times 2-3 days in a row. On Oct 21, I started spotting if I can recall it was reddish, pink then brown it’s been going on and off like that for almost 6 days now. But yesterday it didn’t completely soak my pant liner like a normal period but it was a little more than spotting and it was red. Me and my SO other had sex the 3rd day I was spotting and when we were finished it was blood on him with one tiny clot. Today I thought it was just my period but it went back into spotting again. It’s pink, brown and red. I’m having mild cramping nothing like normal period cramping and I’m having back aches.