I am 18 weeks pregnant and for the past few weeks at night I have been getting a huge pain in my bump that wakes me up.... Feels sort of like cramp. It also goes tight and hard for a while then goes. Was wondering if this is a Braxton hicks contraction as I thought these were painless and there is only one. Or could it be that I'm not sleeping in a good position and supporting bump so it's getting sore...?