I wouldn't jump to conclusions just yet. It's only been two weeks.
You can read this recent thread where somebody was worried their packet got lost and filed for second time:
Even in the worst case scenario, if USCIS rejects your packet ans returns it, you'll still have close to 2 months to file again.
Please prepare for long waits in this process. I-751 is painfully slow overall. My I-751 took close to 21 months. And there was a gap after biometrics reuse to decision of 15 months when there was no status change, no letter, nothing from USCIS! There was a 6-8 weeks gap at the beginning after sending the packet, and close to 6 months gap to get biometrics reused update.