30 weeks pregnant - Braxton Hicks

So I felt the first Braxton Hicks this week. I was sat up in bed because I couldn't sleep due to my cold and felt an odd sensation. I put my hands on my belly and felt it again. I described it to SBB as it feeling like one of those storage bags that you suck the air out of. It didn't hurt and it wasn't uncomfortable. If I hadn't been awake I wouldn't have felt it and if I'd been otherwise occupied rather than just sitting in the dark, able to put my hands on my belly, I probably would have just assumed baby was head/bum butting me or having a big stretch.