Sleeping Position

Stephanie • Mother of a sweet little boy (11/13/16) and little girl (08/30/2018)! 2 MCs (12/20/2015 and 7/25/2017)
Since week 15 I've been trying to sleep on my side. I find myself on my back in the middle of the night but hoping not for too long. I'm recovering from jet lag and slept for probably 4-5 hours on my back this morning (almost 20 weeks). Is it really bad for baby? I'm really trying to sleep on my side but not always the case.