Everyone is different Teresa, it depends on when implantation occured. Unfortunately waiting it out and continuing with the tests is the only option. At 5+4 I had hcg of 85, then 157, 365, 500, 1500 but unfortunately i mc after that.
The levels should double every 48 hours, if it doesnt that can indicate something isnt quite right but there are women who are simply slow starters and their hcg takes a while to get going then they go on to have a healthy pregnancy.
Everyone is different, try not to worry and whatever will be will be. Fingers crossed for you and sending you lots of sticky dust x