So I just found out yesterday I'm expecting, I should know the deal by now as I'm on #4, but I've never had such bad back pain before ....I started getting it the week before...so I assumed I was going to start my period as usual, but I didn't, the pain has only gotten worse though, with my others I had the usual cramping like I'm about to start at the beginning, but ive never had this....anyone else? Thanks.