You will be considered illegal, which means you will be required to come pick up the decision in 2 weeks (not necessarily you will have it, might take longer) and if they deny ,they send your case to immigration court, if the judge denies, you will be deported from the U.S, and I doubt you will be allowed to the U.S in future. The whole process usually takes about 1 year (give or take a few months). So it's up to you. If you can extend your visa for more than a year,you will not be deported. What type of visa do you have?