That is what being on birth control means. It changes your hormones so that you cannot become pregnant while you take it as directed. You are protected every single day of your cycle.

If it's the pill you need to still use condoms for the first 30 days you are on the pill. After that you should be good to go.

Afializ, why 30 days? A pack only has 21 active pills? If you said 21 or 28 I could understand it but 30 days sounds like an urban legend to me. The actual time is 7 days at startup. It is fully described in the brochure that came with the pills. Even without any birth control, a woman is fertile for only 7 days each cycle.