It could be any number of things. The back end pain may be constipation or if you've had anal sex recently. It could also be hemroids. With the side it could be just a sore muscle, a muscle crap or even possibly your kidneys.
Just because your pregnant doesn't mean every pain is related. I found out that I had gallstones when I was pregnant with my second.
I would just make an appointment with your doctor and be checked out. You really don't want to take chances while pregnant. Even if that's not the cause.
at 3:42 PM on Aug. 31, 2009