It's pretty clear what happened here. It's between two options. One is more likely than the other. The first option is that someone was murdered in that bed. By the looks on these women's faces though, I don't think that's the case. People don't tend to look that happy after a murder has just taken place. Especially if they have to have a photo op with the blood stained mattress afterward. The second option is far more likely. This mattress is proof that one of those woman entered womanhood.
That seems like a lot of blood for that, but how am I supposed to know how that sort of thing works. I've never had to deal with that problem. I feel for you women. You got the harder job for sure. Sorry about that, gals.