labor? False labor? Just crazy?

Okay I am 39 weeks pregnant and well yesterday evening I began feeling totally off like everything just feels so different. My pelvic pressure is stronger and it feels like the baby is pushing on new areas that are lower. I have this awful pressure and lower back pain that's keeping me from even trying to sleep. I have this pressure like I have to poop but I don't, and when I do go it's very loose BMs. I have these pains in my lower abdomen that feel as if my baby is pushing on my cervix or punching it, I've had that for a few days now but it feels like it's lower now. I was feeling some sharp constant pains at the top of my uterus but they've stopped, now it's mostly just toward the bottom of my uterus. And I just have this weird feeling like something is going to happen. Maybe I'm just wishful thinking idk. But I came here for opinions.
Also TMI but
SO and I had sex today and afterwards when I got up, there was this bright white discharge on him from me like in a stringy gloop. Ive had discharge my whole pregnancy but not like this n not after sex.
The biggest issue is all the pressure I'm suddenly feeling in my pelvis and my lower back and the bottom of my uterus. It feels like I have a big gas bubble that just keeps getting bigger or something n it's pushing on everything.