33 and obese

I'll be 33 this year, I had my first child at 26 weighing 278 at conception and 311 at birth. I gained a lot of weight after my son was born as well. Today ironically I weigh 311 lbs again even after recently losing 40 lbs. I want to continue to lose weight but I also want another baby. I have been trying for a few months and I feel scared like I can't get pregnant. Is there anyone else like me that I can relate to in my age and weight range and did it take you a long time to finally conceive?