I started off at 130lbs when I was prego with my son who is now almost 5. I gained 100lbs with…

I started off at 130lbs when I was prego with my son who is now almost 5. I gained 100lbs with him!!!!! Yes 100!!! I now rest at a hefty 230lbs. I always said if I got prego again I wanted to lose weight first... well SURPRISE I’m 4 weeks and 3 days. Any advice on good meal plans?? I’m hoping to only gain the weight of the baby. I know that my OB is going to only want me to gain a small amount. Can I potentially lose 10-15 lbs first trimester if I start a healthy diet regimen now and walk daily so that I can have a 10-15 lb cushion? I really don’t want to end up 300lbs at the end of this!