Your options agreement should tell you how many shares you have rights on and what your strike price is. The company, if run honestly and transparently, will tell you how many shares are outstanding and what the current valuation is. From there you can do the math on potential outcomes. If they won't give you formal disclosure of that information, assume the worst.
I'm pretty sure this is wrong. I think in California and Delaware (most startups) stockholders are entitled to see the financials of the company.
I doubt most companies would deny this right if you sent a notarized/certified letter with notice. And in the worst case a judge would most likely side with the stockholder.
Your options agreement should tell you how many shares you have rights on and what your strike price is. The company, if run honestly and transparently, will tell you how many shares are outstanding and what the current valuation is. From there you can do the math on potential outcomes. If they won't give you formal disclosure of that information, assume the worst.