Don't worry. I did the same too, I somehow completely missed the info about using it only at night for the first week and was worried as well but I guess it just sped up the dryness side effect. That's really the only harm it caused me. As long as you're not incredibly irritated by now, it should be fine.

if your face isnt that dry then you're good! ..you are just suppose to start with a little amount of BP ..just so your skin gets use to it and doesnt dry up severly

It doesnt' matter that you did it twice. They recommend you to only do it once the first week just so your face doesn't get too dried out or red.

By now you should be using it twice per day anyway, so don't worry if you have been doing it this way all along. The recommendation of using it only once daily for the first week is to help with the adjustment period and minimize initial side effects. If you are adjusting well and have been doing it twice daily, just continue on. If you are overly irritated though, you can slow down for now.