Abdominal pain??

27 weeks pregnant and since last night I have been experiencing constant abdominal pain. Feels like I got punched in the stomach or did a strenuous ab work out. The baby had been on my right side for awhile now and went on a kicking spree last night...so not sure if I'm sore from the kicks or maybe ligament pain? It's so hard to tell what's normal / what's not. Anyone experiencing anything like this?