Cramping, then fades away...

The past few days I have finally felt BH contractions, where it feels like baby is stretching out all her limbs at once and my stomach feels tight and uncomfortable. Now I was dozing off in bed and my belly felt very crampy and baby moved around, and then it faded away. And then got crampy a bit later, and faded away. And my lower back feels off, like I need to stretch or twist, or that gas is built up, and then the feeling goes away. And I keep feeling like I have to go to the bathroom. It is just, different.