Girl, you have to go to you gynecologist to have these types of questions answered. In a general way you have to wait until your period starts and then start taking the pill, at least for the pills that come in 28 pills blisters.
If what you are trying to do is to get a contraceptive method for the next few days you cannot get it just starting to take the pill. Rather you have to ask your partner to use a preservative. Or you have to wait until you have a proprer contraceptive method working.
Any man that loves you will wait. Don't rush, these are very serious matters, you don't want to make mistakes.
Go to your gynecologist.