Could use some support

We have been TTC for about 3 months now for our second child. We are still trying as we want nothing more than to have another child, but I am about 100 lbs over weight. This has been a major struggle for me as my self confidence has gone down and I just can't seem to lose it. I am so extremely afraid that if I do get pregnant I will put on even more weight. I am at a loss for what would be best. I mean, is it possible and healthy for a baby if I were to continue my weight loss journey (in a healthy way) while I was pregnant? Is it OK for a pregnant woman to lose weight while pregnant I'd she is in the "obese pregnancy" ratio? Any thought/ suggestions would be appreciated.

Thanks!