NG79

Hello all new to the forum today. I'm starting to worry a little that I've reached a bit a brick wall too soon in my weigjt loss journey. Had sleeve gastrectomy op Oct 8th I've lost around 37kgs in that time which was 22% of my original weight, should this be higher? I've not really stepped up the exercise side of things feel very tired a lot of the time. Just wondered other's experiences and based on that can I expect it to keep comimg off? Still can't eat a lot some days better than other.