First baby and worried!

Wats chemical ? Seen it been posted on here? Some of things being posted on here are scary like if you haven't had no symptoms then it could be going wrong or if vaginal discharge smells or itches then it's going bad I really need some reassuring this is my first baby and I'm so scared and nervous I want it all to go perfect and if u test again and it's still a faint line it could be going wrong also!?