Carrying postpartum weight in new pregnancy!

I have a 12 month old son, I'm still carrying 20 pounds extra from my pre pregnancy weight, I'm noticeably larger. My eating habits during my first pregnancy as well as post partum eating habits, were just horrible and it took a toll on my body. I'm pregnant now 5 weeks tomorrow and I'm so upset I'm starting this pregnancy overweight. However I've been eating super healthy and I know the baby at all stages of pregnancy gets soo little of what you're eating. I know this because my first pregnancy, my poor son grew in my belly while I ate NOTHING but refined oils and trans fats along with my prenatal vitamins and he is a perfect healthy and smart baby/toddler Haha. Is it possible to lose weight while pregnant in the early stages? I'm hoping I dont get hit with those bad cravings again where I can't control myself.