Still losing weight

Ashy • I have two amazing boys, born 05-30-2015 and 04-07-2017 and we are going to have another baby in December 2018😍😋
Hello everyone what can I do?
I weighed 162 when I got pregnant and now I weigh 152 and I have have gone down every week..... I am 18 weeks and a day but my doctor didn't see me until week 14 for the first visit / ultrasound so she hasn't monitored my weight loss I've told her but she doesn't care she said well stop losing weight..
.anyways it's not that I am throwing up   I dont throw up every day or every other day it's just random.. I eat good usually so what do I do my doctor is an ass and I can't get another doctor..