not gaining - 14 weeks

so I'm a little over 14 weeks and I haven't really gained any weight.. I started at 144, lost 2 pounds from not having an appetite for the beginning of the first trimester. I gained those back so I'm at 144 again. but I haven't gained anything else. I hope that's normal. I'm also not showing at all. I have another Dr appt on the 18th.. just a Doppler check in. had an ultrasound last week and all was well. just worried. it is my first baby and I thought you were supposed to gained about a pound a week.