From what I understand, as long as your legs doubt get tingly, fall asleep or go numb and you aren't feeling discomfort then you're fine. I'm not qualified in any way to answer this question with 100% certainty though.
I sleep on my back and on my side which boarders on the stomach. Sleep however until you are uncomfortable.
As soon as I saw you, I knew an adventure was going to happen - Winnie the Pooh Married 8/22/09 Pregnancy 1- EDD 11/21/10 NMC @ 6 weeks Pregnancy 2 - Rainbow DS born 1/15/11 Pregnancy 3 - EDD 5/2/14 NMC @ 6 weeks 9/4/13 Pregnancy 4 - EDD 6/11/14 BO @ 9 weeks D&C 11/8/13 AF arrived 12/18/13 BENCH IS BURNED 2/2014 TTA until May/June WOW!!! I'm pregnant!!! BFP 6/8/14 Rainbow on the way EDD 2/14/15
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Its ok for now. Once baby gets bigger it can put too much pressure on the major vessel that brings blood back to the heart. Like others have said, your body will tell you when you need to roll over.
Re: Is it ok?