Insomnia help!

We recently found out we are pregnant, only 4 weeks. I have had severe insomnia for over a year and have been on Ambien for a while now after having tried every solution possible. I know I can’t take this during pregnancy so am seeing if there are any natural remedies that may have worked? I’m terrified I won’t sleep at all. 😣Unfortunately Unisom and melatonin don’t help me. Thank you!