Weight Gain

Amanda
Is anyone else having issues gaining weight? I was about 150lbs before getting pregnant, at 6 weeks I weighed 157lbs at the doc, at 15 week appointment I was down to 149lbs, today at 18 weeks I weighed myself at home & I'm 143lbs.  I eat regularly, & baby always looks great on the ultrasound, just kind of getting worried at this point.