Hcg level?

Hi there! AF is due 3/21 so I'm 5 days out from that. I am just curious is anyone knows what my hcg level might be right now if I was indeed pregnant? I tested yesterday and today with sure predict tests that are supposed to pick up hcg levels as low as 10. When I was pregnant with my son I tested negative until I was 2 weeks late. Any info or advice would be very appreciated. :) thanks!