Hcg levels anyone?

Whitney
I am newly pregnant about 4 weeks. Last period was on nov. 29th. I have very irregular periods and had a miscarriage in may. I had my blood drawn yesterday and my hcg level was 64. I need to repeat on Friday but my doctor called and said that my levels were pretty low. I am so nervous I am going to miscarry. Hubby and I are so excited but trying not to get our hopes up. So I wanna know what your hcg levels were at how many weeks. I need some reassurance ladies please!! 🙏🏼