sleeping and resting on tummy ?

Angela • Momma to 2 bio sons and 1 adopted daughter. 3rd pregnancy, 4th baby!

I've heard that as long as it's comfortable, it's safe. I'm 18 weeks and just starting to feel my uterus in my abdomen. my first pregnancy, I didn't lay on my tummy at all, even at 5 weeks, because I was scared of harming baby. If your a tummy sleeper, when did it become too u comfortable for you? Thanks.