4/9 WLS and stall now?

I know we should expect stalls but already? I am now able to start pureed foods so that is good news and I have shed 9 lbs which is also good for a lightweight. I guess I had better drink more water or protein (is it time for that, again?).

What time periods are normal to have stalls?

Protein and fluids are key, and likely deprivation of either has caused the stall.

I stalled about every 5 weeks then installed for 10 weeks straight, but I am Vsg . It's a roller coaster . And it will pass.

Stalls happen.  If you are getting in your protein, fluid and following your plan, you will lose.  Just keep on keeping on.  It will happen.  I never stalled but I think that is the odd not the normal.  Take your measurements, sometime you will lose inches when the scale seems stuck.  If the scale is bothering you, hide it and weigh once a week.  Mainly, keep up you plan, get in your protein and fluid and relax. 

Hang in there, you body is going through some major adjustments. Keep following your plan and stay hydrated, and it will come.

Everyone is different but usually around 3 weeks.

You are doing great.