What to Do in case your taxpayers check on the Stimulus did not come yet?

Do you (anyone) have delays in getting your Taxpayer Stimulus Check? I have been waiting on mine, which is not coming, and I am beginning to feel bad about it. Is this the way it is, or do I have something to worry about? I heard of few people whose checks were delayed due to several reasons. What is the most appropriate move in case your check does not arrive on schedule? Should I contact the IRS, or can I do so some other way to trace it? Any suggestions on how to deal with delays would be welcome.