I'm 14 weeks and a couple days so I was a bit concerned
For better blood flow you need to switch sides. I really cannot sleep on my left side. Its way to painful, so i have to sleep on my right side or my back.
^ my question too. I was having the same problem, just got a ultrasound and found out it was my baby's feet hanging out there.
How far are you? Are you sure your baby isn't in your ribs?