Thank you for your question.
There is no such thing as a safe period in young fertile women. There is also no such thing as safe sex without a condom. When you have sex without a condom you are exposing yourself to the risk f several sexually transmitted infections as well as the woman getting pregnant. It is much better to plan to not get pregnant by using regular reliable contraception in addition to condoms. Condoms are good for preventing infections but have a high failure rate as far as pregnancy is concerned.
You can read more on WWW.FPA.org