Low levels

Cassie • Currently pregnant and I have an amazing 9 year old daughter!!!
Can any of you ladies remember your Hcg levels and experienced them rising but not doubling and still have a full term pregnancy? Here are mine, hopefully someone has a similar story to mines and had a healthy baby. Ok, 50.7
337
443
466
1700
2200 
I'm having an U/S this Wednesday and praying for a miracle. 🙏🏽🙏🏽🙏🏽 Also the nurse told me my cervix was closed and no signs of bleeding or cramping was a good thing. She also said that my lining on my uterus was thick. I just started experiencing morning sickness as well along with a lot of other pregnancy symptoms. Please let me in on your experiences.