What she is asking is do you have to ovulate to get pregnant. Her doubt is the fact that she either may think she got prego without ovulating, or that she is trying to get pregnant on a non-ovulating day. Yes sweetie, you must ovulate to get pregnant. That is the day you concieve. You don't necessarily need a period though. Many go months without a cycle and still concieve. It just all depends on your body, and how fertile you are.
Your question wasn't specific enough to know exactly what your doubt is. Google it
Ovulation starts before the period. Your menstrual cycle is when your uterus sheds the barrier that would have nurtured the fertilized egg.