New seller with velocity/sales amount question

I’m new to selling on Amazon, my account is 2 weeks old. After a week of back and forth with seller support, I received approval to create listings for a certain brand. I created the listings and in 3 days have sold 7 items for around $12k.

My question is should I be concerned about selling too much too quickly? Will it raise any red flags?

I’m concerned about them deactivating my account and holding my funds after reading so many horror stories on here.

I am selling as FBM and shipping out same day with Amazon shipping, insured with signature required.

I source my products from local distributors. And I know my products very well, as I use them daily in my industry.

Any advice for a new seller?