The details above are vague. While in the bath yesterday I had this sudden pain in my lower back that lasted about 30secs then it dulled down but moved to my lower abdomen like cramps. During all this I began to get really nausea's. I got out and thought maybe I had the water too hot. Well today while riding my ike it happened again. It only lasts aout 15 mins all together but it really hurts. I am not on my period currently and I have and IUD so I "shouldn't" be pregnant. Anyone have any idea?