To avoid having a baby or unwanted pregnancy, it is better to have a good contraception. Remember above all that the "withdrawal" method or "coitus interruptus" is absolutely not a contraceptive method, on the contrary, you would be surprised at the number of pregnancies that could cause ... a milliliter of semen contains more than 20 million sperm, you have been warned!
Then you should also know that a woman is fertilized at any time of its cycle. There is no point to count the days ... It does not work either! This becomes particularly account by making the temperature curves.
The morning after pill is an emergency alternative, but is by no means a contraceptive pill. It must be taken in an exceptional way.
Finally the pill does not protect against STDs, so do not obviate the use of a condom.