The same thing has been happening on and off all through last night and this morning, so I'm assuming that it's just normal 3rd tri stuff . For a few hours I'll get cramping, sometimes with back ache, sometimes not, every 5-10 minutes, and then it stops for a few hours. I have been having alot more BHs today, so I will watch things, but it's probably just what happens to lots of women . The unknown is very hard in this situation, but I'm trying to relax