Grab car e-brake and I almost hit against the front seat.

I was not fastened with seatbelt at the backseat as it was just a short distance (like a 10mins drive to reach destination). I didn’t expect to experience the shock of my life where the driver step onto e-brake and I almost hit against the front seat! Luckily my tummy didn’t slam against anything. But I got the bad shock and my tummy has this very cramp feeling. May I know if I should ignore it (I’m currently 14w) and monitor.. or should I go see doc just to be assured? Not sure if I’m thinking too much.