Pick yourself up some cheap test strips to test yourself.
30 days works for some people and doesn't for others. We had one guy on here who went for 2 months and still wasn't clean.
Exercise with a high fiber diet to keep the shit moving.Metamucil can help. Stop exercising 2 or 3 days before the test to slow down the releasing of the thc. Subbing is always an option if you can't get clean in 30 days.