First grow ever, GDP

I realized while transplanting last week that I messed up big time. The roots on all the plants were still the size of the red solo cup I started them out in.... and they were real solid. I broke them up and planted them with my fingers crossed. It’s only 2 days after transplanting and there’s a lot of new growth. I don’t know if that’s because the roots are happy or because of the nutrients I gave them