I slept on my back through my entire first pregnancy. I didnt know about the no lying on your back thing. With my second pregnancy it got a little harder towards the end as it wasnt real comfortable. I mean flat on my back with maybe just the one pillow. I asked the Dr about it and was pretty much told it you find it comfortable it should be fine. As long as you are not getting any dizziness or numbness or anything it is fine.

This pregnancy for me I cant lie flat on my back, I get dizzy and nausea.