First time taking ocp. when is it safe to have unprotected sex? i started taking on the first day of my period. period just ended. (has been 7 days). i am taking as directed. (same time every day). it is a low dose hormonal pill. (vienva?

Many OCP's claim effectiveness after the first weeks of use, however your body may take time adapting to the hormonal change. Many OBGYNs will suggest using a backup form of birth control for the first month. If it matters that would be a realistic way to go.

Taking low dose oral BCP's as described will confer over 95% protection from pregnancy.

Nothing is 100% when trying to avoid pregnancy. Pills, condoms, IUD, and any other method, one can still get pregnant. Always be aware and take all precautions.