I still get massages and I think starting next week I won't be able to lay stomach down. I have been so far but it's starting to get uncomfortable. Definitely talk with your ob though!! I think I stomach slept til about 20 weeks with my last pregnancy too actually.
Re: Back/stomach sleeping
Sleep position in pregnancy Q&A | Tommy's (tommys.org)
there is also a NIH study that says back sleeping has no bearing
Science Update: Sleeping position during early and mid pregnancy does not affect risk of complications, NIH-funded study suggests | NICHD - Eunice Kennedy Shriver National Institute of Child Health and Human Development