Do you think Unisom is safe to take on a regular basis during pregnancy?

My doctor assures me Unisom is safe to take nightly to help with sleep. Benadryl and Tylenol PM are safe as well but Unisom is the one that has actually been studied in pregnant women and shown to be safe so that is what she recommends. I am 14 weeks and take it 2, sometimes 3 times a week. Just wondering opinions out there. Thanks!

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