Second period this month?

Sophie

Earlier this month I had three days with no symptoms other than very light continuous bleeding that was kind of brown, I just figured my period was easy because I tend to get easy ones when I’m stressed. But, now about two weeks later I’m getting a lot of cramping, boob soreness, and mild mood swings.

I know I can’t be pregnant because I’m a virgin and haven’t done anything sexual. Does anyone have any advice as to what’s going on? Thanks!