I had unprotected sex and about 30 hours later had girlfriend take plan b, five days late on period sore breasts and slight cramps? is she pregnant

Plan B: Potential side effects w emergency contraception include: menstrual flow changes (spotting, bleeding, early or late period), nausea, vomiting, dizziness, fatigue, headache, breast tenderness & abdominal pain or cramps. Take pregnancy test & notify dr if your period is 7 or > days late. She could be pregnant or this could be Plan B side effects.