red gooey substance during period instead of blood. I'm majo

Hi everyone,

I recently noticed that during some of my periods, instead of liquidy blood like normal, I've been getting this bloody/red gooey substance. It's like the white discharge you get before your period except for it's bloody and there's a lot more of it. It happens for most of my period (maybe three to four days). I'm a sixteen year old and I haven't had sex.

I'm sorta concerned. And a little embarrassed. Can anyone direct me to some information sources as to what this might be?

Thanks.