Weight Loss while pregnant

So I’ve always been pretty thin, I was 120 pounds 9 months pregnant with my son & 140 pounds 9 months pregnant with my daughter. After she was born I dropped back down to about 120 and I was perfectly happy with my size. but then the pandemic hit I lost my job and started stress eating like crazy. I gained and I’m back up to 140 which does not look good on me since I have a smaller frame and everything is only in my stomach & new double chin. I started trying to do some work outs and eat healthier and I find out I am pregnant. Can I still try to focus on losing weight while pregnant? 🥺😭 I feel so depressed about my weight and how I look and now the thought of gaining for a pregnancy is just terrifying. 😓