Which is the Safteyperiod for not getting pregnant?

Answer 1

There is NO safety period for not getting pregnant. A human female can and does ovulate on errant days of the month, and can become pregnant on any day in her cycle. It used to be called "Vatican Roulette"--a woman and her husband/partner would try to guess when that woman might get pregnant and thus abstain from intercourse when she might become pregnant, or guess when she might GET pregnant, if a child is what the couple want. Obviously, it did not always work.