I am 18 years old and am sexually active, I am on the birth control pill and take it everyday. One day I thought I was done with my pack an started a new one but soon to find out I skipped one of my red pills ( when on my period ) and started a new pack will that affect me getting pregnant?

Just one red pill not taken should not make a difference. You should be OK. Just to be on safer side ( of course pill is not 100 percent anyway) this month use condoms also, as a second line of protection.\\