Does anyone know if it's bad for my milk production or baby belly to sleep on my tummy?

Before I got pregnant I always ended up on sleeping on my tummy (much to my chiropractors dislike). For the past 12 weeks it's been too uncomfortable to sleep on my tummy (because of very sore BB), hence I haven't slept much as I find it really really hard to sleep on my back and side.

But now I seem to find myself sleeping on my tummy and a friend of mine said doing this could cause problems with the milk glands because of the pressure on them. I do get sore from sleeping that way, but I am sleeping. I know I wont be able to do this for much longer now i'm almost entering the 2nd trimester, but does anyone know if it's bad to be doing this for now??

I wont see my OB for a few weeks so I wont be able to ask him for a while. Thanks