I'm sorry! Mine was like that last week and I don't think I've lost anything or maybe a lb this week, (my scales have run out of battery so it said I'd gained 6lb first time round lol)
But I hear you! It's hard when we are expecting a loss but it slows down. Do you look back over the pattern each month since your op? When I lay it out, the week by week losses, I can see that there is one week in the month where I only log a 1lb loss and can see the pattern of when it ups - this helps me to get my head around it a little more . . .