Can a girl pregnant if she not have period?

Yes, a girl can become pregnant even if she hasn't had a period, especially if she has started menstruating irregularly or if her periods are absent due to other reasons like hormonal imbalances or stress. Ovulation can occur before the first period, making conception possible. It's also important to note that some girls may have irregular cycles where ovulation and potential pregnancy can happen without a regular menstrual cycle.