WHAT IS THIS?

Guys I have no idea what this is. So backstory, 2 days ago I was still on the last 2-3 days of my period but they’re really light so me and my bf had sex with a condom. It broke. That same day I started using a new brand of tampons (U by Kotex) also, this was barely my 2nd cycle EVER using tampons. I used Tampax the cycle before with no issues. So what is this coming out of my vagina??? I’ve been having a little of an itch since yesterday but it’s calmed down so I thought it was just maybe irritation from rough sex but I just took a shower (put a finger in there) and this stuff that looks like tissue keeps coming out when I take my finger out. I’m trying not to freak out but this has never happened to me before. We don’t normally use condoms & I’m new to tampons, could it be that?? Please help. Should i see a Dr? I’m 15m pp if that is of any use. Could it be lining that failed to come down during my cycle? So many questions sorry I’m just worried!