Pop!?

Rachel
Around 2:30AM I felt and heard a loud POP. The sound woke up me and my husband. I'm 100% sure it wasn't gas and that it came from
Inside me. I thought maybe my water broke, but there wasn't much fluid/discharge. I'm just now (8:30) starting to feel some cramps very low, under the bump. Baby is still moving. I have an appointment at 11 today but wondering if anyone had any ideas.