Sleeping on belly?

I’m 18 weeks and 1 day and I have slept on my right or left side since day one. I think I have sciatica because every morning i wake up my hips/butt hurts from laying on it. My question is, is it safe to lay on your stomach? I always get so nervous so I don’t do it but I that’s where I’m the most comfortable at night is on my stomach.

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