[Lizzie]

She needs to take another test. It’s true that if she got a faint line that still counts as a positive. But you are right; she should have not gotten pregnant from the encounter your described. If she gets a second positive pregnancy test, she needs to see a doctor.

In fact, from the symptoms you are describing she needs to see a doctor either way to make sure she doesn't have an infection; they can do a pregnancy test at the doctor’s office as well. That is her best and safest option right now.