That was so humiliating

One of my sister-in-laws had a birthday party for her son. All her family and friends were there. Some of them know me for a while now back then I was skinnier I now have two toddlers. Well we were all sitting there at a table let’s say about 6 of us you know just talking and (I have gained weight compared to how I was before) well we were talking and of them tells me “ omg are you pregnant” and I didn’t say anything and she asked her cousin is she pregnant”? and I told her “bitch” (in a joking matter) because that’s what i wanted it to seem like even though inside of me I got hurt 😔 when she told me that. I felt so embarrassed and everyone just stayed quiet because that was uncalled for. This still haunts me to when she said that. Like how I got so big how did I let myself go. People making jokes about me really hit me. I’ve tried changing my habits and I’ve failed so many times I was doing so good 2 weeks ago and I have failed again 😞☹️