About 2 weeks ago I had under 30 pages indexed in Google, about 3-4 days ago I only had 50 today I have 220, They went up really fast, Is this because of the upcoming PR update?
Yes expect to see some big changes from google in the coming weeks as they are getting ready for there PR update.
I agree with you I have also seen a good increase in my indexed page. But you need to wait for the PR update to confirm whether this increase in indexed page is permanent or temporary. It's a common thing that you have huge number of pages in Google index for a week and the next week they are just left by the GOogle