665.hcg level

Hey guys, so i got a positive test.2 weeks ago. I went for blood work and my level was 13 and the next day i had bleeding and cramping so i assumed it to be a miscarriage or chemical. My fertility clinic wanted me to come back on the monday for a redraw but with the bleeding i wasnt hopeful, i let my mind and anxiety get the best of me and didnt go for my re draw for a week and a half and yesterday i got an email saying "congratulations your levels increased to 665" i was so surprised and im happy i just want to know if 665 is a good number. I really thought the bleeding was bad so it had me scared