Period after pregnancy.

Posting for my friend who is not on Glow. She just had her first baby on November 17th. She is not breastfeeding. At her 6 week post partum check up she started a low hormone birth control pill. She has did not get her period during the last week of taking the pills. She has has sex multiple times, using the pull out method. Is it typical for her not to get her period yet, or do you think she is pregnant?