37 weeks 5 days

As the days keep dwindling down until this little makes her entrance, I'm growing more inpatient. It's baby number 4 for me and you would think I'd know all about pregnancy and labor but it's been 6 years since my last baby and I feel like a newbie. I've had severe pelvic pain for the last couple of months which I've never experienced before but I was told by my OB that with each pregnancy things like that get worse. I've had a lot of Braxton Hicks since very early on as well. My heartburn with this pregnancy had been worse than any of the previous pregnancies and I woke up this morning with constant periods like cramps. I haven't been checked for dilation or anything yet this time and I'm not sure why exactly. Could this be labor starting soon since I'm almost 38 weeks or should I be expecting to feel this for the next 15 days or so? All 3 of my other babies were born in the 39th week so I don't know if that means this one will to or if I could go earlier or later.