Nope! As long as your comfortable!
Lol I tried earlier today, I'm 25 weeks and my lil one beat me up, so I figure that's the only issue is the baby may be uncomfortable.
I have always slept on my tummy. But after about 15-16 weeks it became uncomfortable. I am 20 weeks today tried last night but my little man clearly did not it because I got kicked A LOT
I think they're pretty well protected in there. I'm 32 weeks and its getting uncomfortable to even lay on my side. Soo close to sleeping on my tummy again!
Your baby will let you know if he or she is uncomfortable