HCG LEVEL QUESTION..!

Co
I went to the hospital about three days ago just because I was getting very bad cramping. I got my levels taken and everything. I was only 3.5 weeks I suppose and my levels were only 83/85. Which I looked up for the week by week chart. An the chart said it was normal. While the doctor said it's really low. Well I don't go to the doctors until Tuesday to get re tested to see if they have gone up or not. But if my pregnancy lines are getting darker and darker when I take test every other few days. Would that mean my levels are going up? Since the lines are getting darker. Sorry very worried just want this to be my rainbow baby /: