So Monday (4w5d) I went in and had my first blood draw at 3:30pm and my hCG count was 360. Yesterday (Wednesday, 5wk0d), I had them redone again at 3:30pm (exactly 48hrs later). They called today with the results and the hCG count was 608. They increased but did not double which would have been 720. The nurse said the dr was not concerned at all, however I was concerned because I've always heard they should at least double every 48 hours. They rescheduled my first appt and u/s from 4/10 to next Wednesday when I will be exactly 6wks just to give me a peace of mind. Do you ladies think I should be concerned at the fact the numbers didn't double?? Also, at 6w0d, will I be able to at least see the heartbeat on the u/s?