Assuming you rinse your sprayers after each use you probably did no harm. Even if you didn't rinse the product probably lost most/all effectiveness over the 2 weeks of sitting.

You are probably fine.

I have 2 sprayers as well as 6 small hand sprayers. I label mine because I have nightmares about doing exactly what you did.

It happens, but I bet in your case it will turn out fine.

Your garden will show some effects.....even rinsing won't remove all of the herbicide and some succeptable plants will suffer. You will see twisted and odd shaped leaves and some plants may well die.
BUT you may not see those effects....it depends on what herbicide you used....24D? 245T...trimec?
But there is nothing to be done.....but I will bet you will never make that mistake again!!!

OK...here comes the lecture! Quit using the chemical fertilizers on your garden and go with compost and composted manure, a bit of alfalfa pellets, some blood meal and that's pretty much all.
I am not so organic minded that I don't use big guns when it comes to weeds and grass where it shouldn't be....but once I realized how much better my gardens were with just leaves, wood chips and composted manure....I have not touched that miracal grow sprayer.....and with only one sprayer, there's no chance of a similar error.
Linda C