I was a slow loser from the get-go. I was about where you are in the same time frame (it's been several years since my surgery, so I only have my monthly weights - not every week anymore - but at four weeks out, I was down 16 lbs). I went on to lose all of my excess weight, 235 lbs. I've since gained back 20 lbs, although it's super common to have a 10-20 lb regain after hitting bottom.
I did have stalls - not too many the first year - maybe two or three. I had a lot during year 2, though, as I got closer to a normal BMI, and they lasted a long time. Every time I hit one I'd think "OK - I guess this is it", and then the weight loss would start up again. My weight loss finally stopped at 20 months out.
if you stick to your program, the weight will come off, whether fast or slow.