Technical question on birth control

Catherine

When you’re on the sugar pill, what if your period ends and you still have a few days of sugar pills left. 1. Should I start my new pack or wait until I’m done with my sugar pills so as to not mess up my cycle? 2. WILL it mess up my cycle if I start a new packs s soon as my period ends even if I still have sugar pills left? And 3. If I have sex after my period is done but I’m taking the sugar pill, is it possible to get pregnant or does the possibility perhaps increase?

My apologies for all the questions but I couldn’t help but wonder!! Thank you 😅