I forgot my pills at home, and won't be able to take my 4th pill out of the 3rd row of the packet. Will my period change? (I'm not having sex)

Likely not... Pickup where you left off but continue to abstain from intercourse and check in with your doctor.
Yes. When you miss a pill you can expect some break through bleeding.Take the pill as soon as you can even though that will mean taking 2 pills one day.You will almost certainly have some spotting or bleeding but continue taking the rest of the package.If you only miss one pill out of the package, you're probably still protected against pregnancy but remember to use condoms to decrease the risk of STDs.