Guys a little tmi, but hubby and I had pretty rough sex 2 times today, and for about the last 30 mins, I've been having like really bad crampy like feeling, in my lower back but I also feel it in my tail bone, I'm currently laying on left side drinking some water as she wiggles and feels like her knees or whatever it is gonna bust out my belly. .. could this be the start? Last week I was almost a 3cm dilated.. and won't be seeing my doc again until the 10th..