So nervous and scared

This is really taking a toll on me. We have really been TTC and I have this colposcopy scheduled for tomorrow. My AF is not due until the 28th I am so worried the Dr. is gonna do this and I am gonna be pg and have a m/c......on the 18th my hcg levels were a 3 I think that was too early to tell I have no idea I am so confused. I called the Dr this morning to see if she could do another HCG test today before the test tomorrow and I know she is gonna think I am crazy since my test on the 18th showed only a 3 she hasnt called me back yet...........I know this colposcopy is important and I don't know what to do