Chemical Pregnancy?

My OB has been nothing but "busy" since I ever had her. Found out I was pregnant a week ago and based on my HCG per my PCP, I am about 4 weeks pregnant. My OB won't see me until October 3. I am so afraid that this will turn out into a chemical pregnancy and I would love to know the symptoms you had so I am fully aware. We have been praying for this baby for almost a year and now that it's happening, I'm so scared I will lose my little bean. :(

Ease my worries ladies. Please :(