Mom w/3yo & 2yo, hoping to lose 20lbs+

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I'm looking for friends & motivation. I just started a weight loss challenge at my gym (Orange Theory Fitness). I started 2 weeks ago and so far I have lost 4.5lbs. I am 5'6", started at 166 and now I am down to 161.5. Prior to getting pregnant, I was 130lbs. Then after my first daughter, I weighed 155lbs, and I didn't lose the extra weight before having my second! That put me at almost 170lbs after my daughter was born. Anyone with similar goals?