Next short term goal 170 lbs by June 6

I have updated my graph of weight loss and to stay on track, need to be at 170 pounds by June 13. However, I want to try to get there by June 6 because i know I will hit plateaus along the way and it will be harder to lose the weight as I get lighter. I think 4 pounds in 2 weeks is reasonable. i will just have to make exercise a priority.