I was on Levlen for about 7 years. I decided to switch to Ortho Tri-Cyclen Lo this month. I got my new pack during my period, so I started the new pack on the Sunday after my period started. Was that right? I read in the package insert that if you're a new pill user, you should use a back-up for a week. But what if you're NOT a new pill user?! Could I be pregnant because I had unprotected sex on today, on the 4th day of my new pack? I'm just confused because I assumed that I'd be protected because I didn't skip any pills. Any advice/help would be appreciated.