Could a cavity form if I don't brush my teeth for a week?

I had my wisdom teeth pulled out recently and I was not allowed to brush my teeth for the first few days, but on the second one, I started using a prescribed mouth rinse morning and before bed and rinsing my mouth with salt water after every meal. Although I'm not sure that that helps because I'm not allowed to thoroughly rinse or swish the liquid around, it just sort of flows to one side then the other. I'm curious to know, could a cavity form over such a small period of time? It's only been 5 days since I last brushed my teeth.