Although, it is better to not rely on any medication during pregnancy. So, you must try some lifestyle changes before taking any medication for sleep. You can read more about this here: Pregnancy Insomnia and how to treat it. Furthermore, Ambien is a controlled substance, so it can cause withdrawal symptoms in the baby after birth. But sometimes, insomnia can get worse, already affecting the mother and the baby. If you have severe insomnia, you must consult your doctor. How to take Ambien in Pregnancy? Firstly, it is only advisable to take Ambien if your doctor advises you. In contrast, the starting dosage is 5mg-10mg for adults. One needs to take the tablet before bedtime. So, remember to take them when you have at least 8-9 hours of sleep. However, your doctor may suggest less dosage because of pregnancy. So, the best thing to do is just follow your doctor’s advice. Therefore, take the tablets exactly according to your doctor. Also, remember to do no changes in dosage or other things.