Sexscapade

Soooo a really bad thing happened last night... and I don't know what to do. I had sex with a person, and to summarize it, there ended up being 3 other people involved. I didn't really want that but they were all military guys and I didn't want to risk any bad things happening (as if it hasn't already occurred). Please, I don't know if they had STI's or anything, what should I do? I really don't want any extra burdens on my plate. And plus they didn't wear any protection and I was on my period. Help. This all mostly took place in the shower. 😭