Nervous new mom! Help!

Chelsea
So I got my BFP last Wednesday and went to dr on Thursday. My levels were 54 they said they are good that I was just early! They want me back next week to make sure levels are higher. Well I'm a nervous wreck of course! I took a test last night and it wasn't as dark as my first one. Should I worry?? Does this sound like a chemical? I'm sick all day long and have major head aches. No bleeding just clear CM. someone give me advice!! THANK YOU AND BABY DUST TO ALL!