depending on the pill it's generally recommended you be on the pill for a full month before you consider it completely effective. if you have any questions about this consult your pharmacist. remember that the pill only protects you against unwanted pregnancy. it does not protect you against sexually transmitted diseases. for this reason it's still important to practice safe sex with a condom. wishing you all the best!
how long does a girl need to be on the pill in order to safely have unprotected sex?