Quick question (maybe tmi)

Lindsay
So hubby and I had sex and I had an orgasm. A few minutes afterward I felt a lot of pressure behind my belly button and my belly felt very hard. It stopped in less than a minute and hasn't happened since. I'm assuming it was a Braxton hicks contraction but unsure because I haven't had one (or haven't felt it) yet. Is that what a Braxton hicks feels like?