I have had a 3 occurrences today (nothing consistent or anything- and VERY spaced out) where my back has hurt BAD for about a minute and a half. Feels just like it does if you have ever had your back "go out" on you, but for shorter and stronger. Finally during this last one I got curious and felt my belly and it was hard. I get braxton hicks that last for a LONG time, so I am not sure if my belly just happened to be hard from one of those. Anyway... NO PAIN in my belly came with these at all, no cramping or anything- just in my back. Can you have contractions in your back only?