How many weeks am I???

Positive pregnancy test on 3/13 first set of blood work hcg was 105, 4 days later 509, on 3/23 they were 2,445. Gestation sac, egg yolk, and fetal pole present, no fetal heart beat just yet! Any idea how far along I can be? And when did you all hear the heart beat? I go back next week Monday!