I know this is morbid but...?

i'm 17 and about six or seven weeks pregnant and i keep getting this intense fear that the baby's just going to die right there in my tummy. it's really scaring the hell out of me and people keep bringing it up. i'm aware teens are high risk but what are the actual statistics? I haven't been bleeding or spotting or anything and i've always been pretty healthy. are back pains and shrap pains in the abdomen and cramping normal? i'm pretty sure they are. i don't want the baby to die in me. :/