Birth control pills

Me and my friend are going to a clinnic soon to get birth control and I was wondering, because theres alwsays a chanvce that you srill can get pregnant, will the birth control mess up the baby/

First of all to get birth control under the age of 18, even at a clinic you still must have a parent present.
Secondly, it will not harm the baby if you get pregnant on birth control, if your period does not come, you take a test and find out if you are pregnant, and then discontinue use of the birthcontrol pills.
I was on the pill when I got pregnant with my son, he is just fine. I stopped taking them as soon as I realized my period didn't come when it was supposed to, and I tested right then.

 
It is safest to use both birth control pills AND condoms. Besides, condoms help prevent the transmission of STDs.

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if youve had unprotected sex, or think you might be pregnant and want to start birth control now (after youve had sex)
the pills will mess up the baby,
you need to start either before you start having sex, or when you know your not pregnant
later on when your on them if you can be, get a pregnancy test every now and then to make sure your not
because if your prgenant and on the pill, it will mess up your baby