I have been on birth control for a year and a half now. Usually I am great about getting my new pack of pills half way through my period and starting the new pack on time. However, because of vaction and the 4th of July, I was unable to get my prescription filled until yesterday. I have been off my period for about four days now and should have started my pills five days ago. I started my new pack yesterday. Eventhough I have been on birth control for a while, since I was delayed in starting, do I need to wait a week before having unprotected sex before it is safe? Should I treat this pack like the first pack I ever started, or should I just continue using the pills the same way I have for a while now (i.e., having sex without another form of contraception right after my period and throughout the month)?