Losing the weight

Anyone else having issues losing the pregnancy weight?? I am down to my last twenty pounds, been on weight watchers, exercising at least three times a week (cardio) and I'm just really struggling mentally. I'm supposed to get married in December and had bought my wedding dress before pregnancy a size bigger because I knew I was planning on having a baby and wanted to ensure it would fit, it doesn't fit, my stomach is too big as far as lose skin. Spanks aren't working and what's bothering me is it seems it's my ribcage that is the problem like it hasn't gone back to its normal size 🙁 I'm very sad about this and discouraged 🙁