worried 😔

Autumn
I'm 6 weeks 3 days now my first pregnancy. I've been reading a lot of stories on here and some of them are sad . Im scared that I'm gonna have a miscarriage, I'm nervous for my first doctors appointment , I'm nervous about a lot and I may be just over thinking but I am hoping that I fully carry this baby to term . I'm always asking my mom things to reassure myself . I have taken three pregnancy tests to reassure myself that it's real . 
I'm hoping to hear a heart beat when I got to my appointment. I'm 21 , single mom and full time college student . If I didn't have my best friend I don't know what I would do with out him . I just have a lot of fear and doubts .. was anyone else like this when you had your first baby ?Â