I tend to sleep a lot on my front and back. I'm now 15 weeks and sleeping on my front is getting uncomfortable but I still continue to sleep on my back, most of the time unknowingly. But when does it start to become unsafe to sleep on you back and will I need a pregnancy pillow to prevent me doing this? I've got a bit of a bump which is probably mostly bloat, but sleeping hasn't become uncomfortable for me yet, just worried that my sleeping positions my be dangerous for the baby.