@careylee, melatonin isn’t the best idea, your body does naturally produce it so when your body gets it from an outside source it will stop producing it and depend on the melatonin tablets for sleep
I never tried Benadryl while pregnant but I get melatonin tablets from Walmart...it’s a sleep aid but your body naturally produces it...I give it to my 1.5 yr old all the time to make him sleep better at night....it’s safe for children and pregnant women up to 3 mg