If I'm at your place,I will wait until the withdrawal becomes effective before I send the new application.
If not, I can create another problem as double application at the time.
Because,if in their system the first application is not yet withdraw and second one comes,it may result as a double application under the same Alien number.
Relax a little bit and do not play gamble with your applications. It's a lot of money and double stress. It may also go through, but they never know with USCIS.