No, you should get a receipt either way. USCIS sometimes issues them slowly. Get a confirmation of delivery of the motion.
The above is intended only as general information, and does not constitute legal advice. You must speak with an attorney to discuss your individual case.
Especially when you figure in the Thanksgiving holiday, it's only now getting to the point where I think the receipt is just a bit overdue (which doesn't yet necessarily mean there is a problem).
While in the normal course of things you would get a receipt, there may be circumstances where you wouldn't - we don't know enough of the background here.
Consult another attorney directly for a second opinion.
Why did you not ask this quesiton of the attorney who is handling the case?
The information contained in this answer is provided for informational purposes only, and should not be construed as legal advice on any subject matter,not should it be viewed as establishing an attorney client relationship of any kind.
Has the check for the filing fee been cashed? If yes you should get a receipt if no there is an issue. If the check has been cased the receipt number is placed on the back of the check