It could be heartburn or indegestion. I have had both for the past week, with it easing off yesterday (thank goodness as I ran out of Rennie tabs). I think bubs must have moved so it is not squashing up my insides towards my throat! The crampy part is a bit weird as I didn't have any cramping, just felt like I had food stuck in my throat and a bit hard to swallow and breathe when lying in bed.
Maybe Alan will see your post and have some other reason.......