Need to lose weight

Ok here's a little back story. I weighed 200 when I got pregnant with my sin in January 2015. I didn't gain anything the first 20 weeks but managed to gain a total of 45 by the time I delivered in October. I got back down to 200 by like April but for pregnant again. My husband and I just renovated a house we bought and just moved in so for a few weeks all we were doing was eating out and stuff. At my first prenatal appointment at the end of May, I was up to 217!! This is way too much!! I need to lose some weight and get this under control!