am I pregnant

I have a question for you girls I have a friend and she's worried she's pregnant I've asked and all she's told me is that her boobs are swollen and every sensitive she has had her period but her comment was it's a "short one" she's also on the pill her last sexual experience was about a mouth ago so my question as a male is there a possibility it's much appreciated for the help I just want to keep her mind at rest and charm her down