Am I good?

El
So I'm still pretty new to the pill. I'm on my first period with it. And I will start taking the hormonal pills of the second pack tonight. 
So my period will have been for 6 days (I shortened it slightly) I'm spending the night at my boyfriends this Sunday and we're going to have sex. I don't need to wait to get through 7 hormonal pills again to be safe do i? 
And why is it that if you miss one pill during the pack you have to wait 7 days to be safe again but not after breaking for 7 days for your period ?