Need to lose weight in 2 months 😕

Lets first say I’m getting married in September I have to get my dress altered in 2 months. I wanted to be smaller than I am now. Since I’ve had a baby I’m bigger. I’ve never been this big. I feel discussed with how I look. I’m so insecure about my body & everything I wear. What are some ways to lose weight fast!? I cut out all the drinks besides water. I baby sit till 6pm so at the end I’m not motivated to work out but I’m getting to that point I need to. Just low self esteem... So any ideas would be great TIA