I always have 8 to 10 days a month where I lose nothing. Zilch. And, it doesn't go 'up and down' either. It's the SAME WEIGHT everyday for well over a week.
At this point it doesn't stress me, b/c I know that means the last two weeks of the month I am going to lose my 'month's worth' of weight.
It's just the way my body does.
You know you have a good plan and you are sticking to it, all you can do is let your body take it's time and do it's part of the bargain.
You are doing awesome and it's looks like you are getting close to ONEDERLAND!! I see so many of these posts about folks who hit 'mini-stalls' right before being 190something. Maybe it's the internal stress of knowing you are hitting a milestone, or that we notice it even more when we are close to an important marker.
Either way, keep it up and know that at least when the scale DOES start to move it will be nice, good measurable amounts. You are earning credit towards a big whoosh