Sensations

So I felt fine all morning we get in the car about 30 minutes later being in the car I get this Rollin sensation like my lower stomach is going in and out and super nautious..... So we stop at his moms house to let me rest I drank a bottled water and ate some crackers felt quite a bit better get in the car to come back home started feeling sick again..... pregnancy symptoms??? I'm only 4DPO had two miscarriages July&Sept 2015..... Any thoughts would be great Im still getting the pulsing sensations in my stomach and NO it's not gas