You can remain in the US while the extension request is pending if it was filed timely. You will only start accruing unlawful presence once the request is denied.
I agree with my colleague
Samuel Ouya Maina, Esq. 415.391.6612 firstname.lastname@example.org Law Offices of S. Ouya Maina, PC 332 Pine Street, Suite 707 San Francisco, CA 94104
You are incurring unlawful presence. You could leave to reenter and ave to convince the consulate to obtain a visa. Beware of the possible Bar on reentry. Please seek consultation with an attorney. Best Wishes!
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If you filed the extension request before your status expired you may stay in the US. However, if your status had already expired before you filed the extension, you should leave the US before you reach 180 days, unless you have other options.
The answer provided here is general in nature and does not take into account other factors that may need to be reviewed for a more precise answer. You should consult with an immigration attorney before taking any action. The answer here is not intended to create an attorney-client relationship.