39 weeks and labor?

So I'm a FTM so I don't know anything lol but yesterday morning I woke up with the worst menstrual like cramps, one was bad to he point I couldn't move to my back in bed. They stayed all day and I just felt gross and crampy like when you're going to get your period. My stomach was tight, I felt like I had to go #2 or like I just had gas but nothing would come out. I still feel like that today, my legs feel weak, the cramps are back, I'm so nauseous, I'm so moody and can't get comfortable I just really wanna cry lol also for the last 3 days (and now this morning) I've had a headache. Is all this a sign for anything? I really just want my baby out, I can't be pregnant any longer my body feels like it's going to give out :(