? About HGC levels

Ashlee
Just got my results back from my first bloodwork and nurse said my level was 84. She said that was lower and would put me btw 2-3 weeks. I told her that I didn't ovulate till CD 22 according to OPKs (which would put me today at just a little over 2 weeks after ovulation). The ranges they give you online are so varried. 
Have to go back tomorrow for second round but now I'm worried. I was spotting slightly yesterday with some cramping but seem better today (knock on wood). I guess I just have to wait to see if my levels doubled...any advice/experience?