Is the baby ok?

Amber • My names Amber I'm 28yrs old. I'm a full time nursing student and have been with my fiancé for 13yrs. Due 5/4/16
I'm getting these weird fast/twitching/jerking feeling in my stomach it almost feels like the baby's having a seizure! It only lasts for a few seconds and It's definitely not hiccups it's too fast. Has anyone else experienced this?