You normally have a six hour window when taking the pill, meaning that if you were to take your pill up until (in your case since you take yours at 9pm) 3 am. Obviously you should try to take it at the same time every day. I have taken mine 4-5 hours late in one given week oops!! Anyway, I am better now! What you might even do for the future incase you are strapped for time is go ahead and buy two months worth at a time so that way you always have them with you! Good luck, but as far as effectivenss, you should be fine, as long as you don't actually "skip" one.

Don't worry!