My friend is 16 and might be pregnant

My best friend called and told me how her and her boyfriend always have sex without a condom and he always pulls out but a few weeks ago they had sex twice a few minutes in between his ejaculation and she is panicking because she has been feeling really nauseous and having really bad headaches and her period is late 6 days. She's too scared to tell her parents but she doesn't know how to find out on her own.