losing weight while pregnant

Si
So I found out today I am 4 weeks pregnant with my 2nd child. With my first pregnancy I gained 80 pounds. I've tried for the past year to lose the weight and I'm just not starting to get back to where I want to be. Is it okay to lose weight while being pregnant? Mind you I'm 4 foot 11 and 195 pounds. When I got pregnant with my first I was 115