Is this real life!

Just found I'm about 4-6 weeks pregnant. Not sure based of LMP I'm 6 weeks but my periods are so irregular and I didn't track ovulation so I dont know when I got pregnant. Regardless I'm over the moon!! I still cant believe this is happening. I am however worried because I currently weight about 328 lbs. I have been eating healthy and recently lost 40 lbs and I believe that's what helped. I am constantly nauseous right now and not eating much any advice on how to lose weight but not hurt the baby or what I should do.