Hi there ~
I understand your concerns. I believe that if you stopped smoking
marijuana today you will not show it in your blood test
in about 2-4 months. It takes a lot of time to get out of your system as it is a very long half life substance. Drinking water, exercising to increase your metabolic rate, etc will not do anything to get your marijuana out of your system earlier.
I hope this helps. Take good care of yourself and have a lovely day!