Did I flood my septic system?
This is not a problem at all! If there is a bunch of water it will at best wash all the debris down the system. As far as a problem NO WAY! 
You may be able to over fill a system with water but once the flow is reduced it will recover and there will be NO damage. 
I have installed many systems, the only one ones that failed took years when met code. 
Yes you can cause problems with a full flow of water but after a day or so everything will be fine if your system passed perc testing or whatever your state requires.