if she is in her ovulation period then better to take an emergency contraceptive pill. ovulation occurs 14 days prior to the expected menses. imagine her periods is of 28 days then unsafe days are from 11th day of menses to 20th day. ovulation is unpredictable as the cycles of menses. so such a long unsafe period for extra safety. if you had sex before 11 days and after 20 days of first menstrual day then chances of pregnancy are very less. you need not take i-pill. if not then take i-pill at the earliest. for further doubts consult an obstetrician and gynaecologist online --> <link>
had unprotected sex today. should my partner take contraceptive?