Hello, I have a ursine drug test tomorrow and I've done molly yesterday morning? Will I test positive? How can I flush it out quick from my system?

Not wise. If you did molly yesterday (2 4 methylenedioxyMETHAMPHETAMINE) I'm surprised you don't feel lousy today. It can last from 1-3 days depending on the amount. I think that your drug test is going to be iffy so you can either skip the test or take your chance.
Positive-most likely. There is a very high probability that you will test positive. There are many "DETOX" remedies available at varies head shops and online and I would not waste your money. Good Luck.