5 of my friends thought like you and had babies from having sex
only on their periods
. a woman can ovulate at anytime during her
cycle, not all woman ovulate 14 days prior to menses, and younger woman...under 20 tend to have irregular ovulations and random ones. so always use a condom w/ spermacide and another form of birth control ...patch, pill, diaphram, nuva ring, or IUD...if you are going to be sexually active even once.