Any time a girl and a guy have vaginal intercourse, there's a risk of pregnancy. No time of the month is completely safe. The problem is, ovulation can happen at different times each month. So, it's really hard to know when a woman is fertile. It is much safer to use condoms and contraceptives like the Pill. Only condoms can provide protection from most STDs.

Most girls ovulate, or release an egg, about 14 days before she gets her period. The egg can only survive for about 24 to 36 hours. She can only get pregnant if sperm reach the egg while it's still alive. The problem is, ovulation can happen at different times each month. So, it's really hard to know when a woman fertile. Also, sperm can live up to five days inside a girl's reproductive system.

That means, if a couple has sex on Saturday and the girl ovulates on Wednesday, she could become pregnant on Thursday.

Females are least likely to become pregnant two days before their period starts and the first two days of their period. If a girl has sex on day 5 of her period and then ovulates early, say on day 10, there's a chance some sperm could still be alive and able to fertilize that egg. So, no, there is no 100% "safe time" of the month. It is much safer to use both condoms and contraceptives like the Pill.

Anytime a couple engages in unprotected sex there is also a risk of STDs as well as pregnancy. This means both partners need to get tested for STDs at a clinic or with their private doctor.