I haven't had back pain though my whole pregnancy. I am 36 weeks and 5 days. My co-worker brought up back labor and now I am a little concerned. Well not really concerned buy curious. The pain started last night but when I woke up this morning it was gone. Well a couple hours later it staring up again. It's been on and off but I don't think I am having contractions and it isn't server pain just annoying and throbbing. Any ladies go through back labor? Can you tell me how it started?