I'm in my second trimester... I'm actually 24 weeks and a day. N I just keep losing a pound every three weeks
I lost 13.5lbs in my first trimester due to nausea, vomiting, and food aversion. I checked in with my doctors office every once in awhile and they said some women loss up to 15lbs just to make sure I had protein and lots of fluids. Just talk to your doc and you should be fine. I'm 15 weeks now and my weight has leveled off and I have my appetite back finally.
Depends which trimester your in and your prepregnancy weight/BMI.