Teenage pregnancy

One of my closet friends thinks she is pregnant, she's 14 only just lost her virginity and she's having symptoms: morning sickness, cravings, bad pains etc. She's on the pill though and she has been for about two months and lost her virginity about three weeks ago. She took a test which was positive but changed to negative. The dad is dating someone else and so is she because they had sex when going out with other people but that's all been resolved. She hasn't told her parents and doesn't want an abortion but she doesn't want a baby either. She smokes, drinks and smokes weed and no matter what we say she won't stop. Any advice at all on anything I've said will be appreciated massively X