I feel my baby, 2nd child 14 weeks, easily confusing with gas, I got a sonoline b doppler and I took it with me to my appt and my dr pointed out how you knew if it were moving (it makes a certain noise) it was only $50 so if you can you may want to purchase one :)
It is still a bit early. I'm currently 15 weeks with my 4th & have felt this baby sporadically. I don't remember feeling my first 3 till 17-18 weeks. Every one is different though.