Help! Growing uterus, unknown weeks of pregnancy

Michelle

My last period was December 29, 2019. I got a faint positive test January 28, 2020. I went to the doc and did an ultrasound; he didn't see anything, but my uterus is enlarged. He sent me to do get hcg; the first day it was 161.66 and then 588.something in 48 hours. He said I might have ovulated late in the cycle, but he gave me progesterone suppositories for 10 days. Not give been having cramps like in inside of me is stretching.

How soon did you experience cramping and stretching of your uterus?