Subclinical Hypothyroidism Advice

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I've recently been diagnosed with subclinical hypothyroidism, and was put on 25mcg levothyroxine. My OB/GYN thinks that it should help me lose some of the weight I have gained over the past few months. I am not overweight yet, but I'm almost there at 5'4" and 140lbs...I want to lose 20-25lbs.

I have only been on the meds for 5 days so I'm not obviously expecting any results yet...but has anyone else put on levothyroxine lost weight? I also am not sure what to do about diet. I just switched to a Paleo diet so I hope that helps, and have around 1400 kcal per day, and I exercise...a lot. I do 10-20 minutes of HIIT training 6 days a week, I hike 3-4 days a week for 3 hours, and I strength train 6 days a week (spit routine, heavy weights). I have a lot of muscle, but I have not been able to burn any fat off, which is discouraging considering how much I work out.

So has anyone achieved weight loss on levothyroxine?