If your girlfriend starts birth control pills on the first day of her period, she is automatically protected on it. If she starts on the sunday after her period starts, she needs to wait one week before having unprotected sex, and if she starts on a random day (not the sunday after her period, and not the first day she starts her period) you need to wait at least two weeks, and possible one month before you have unprotected sex.
I'd suggest she goes to a family clinic or her doctor and gets prescribed for birth control as soon as possible.
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