11 weeks is too small pa rin, I’m at 12 weeks and sometimes still sleep on my tummy. Remember that the baby is protected by amniotic fluid and nasa likod pa ng uterus si baby so di siya masasaktan. Best sleeping position is on your left side especially if 28 weeks pataas/ pag malaki na baby bump.
This is a comment from an obgyne. I cannot disclose the name as it is from a private group.
Mary Grace Alfonso