Getting worried....I'm 12 weeks and have yet to gain any weight. Does anyone else have this problem? I have my 4 month appointment on Tuesday and I'm wondering if the doctor is going to be concerned. At my nine weeks appointment the doctor stated that she would like me to gain a little more than normal because I'm underweight. Still.......nothing. Baby seems fine. I have a doppler and listen to heartbeat everynight. What gives?