Fluid lining in uterus

Crystal β€’ The Brady Bunch Gang 🀟🏽 πŸ’•πŸ’•πŸ’•πŸ’™
I'm 11+5 I went to er due to spotting and weird smell in urine. Well the outcome was because I have a urine infection and I'm dehydrated. The dr did an ultrasound baby was so active and I heard the baby's heartbeat but she realized that there was a lining of fluid in my uterus I never heard of this. Has anyone experienced this?