Trouble sleeping/Melatonin

Ok so I’m 6 weeks.. I’ve always had trouble sleeping.. started when I was around 18. When I go to lay down, I just can’t relax and fall asleep. If I do fall asleep, I can’t stay asleep all night. So, I would take melatonin every night. My cousin is pregnant and her doc says she’s allowed to take melatonin during her pregnancy... I haven’t been to my doc yet to ask. I have Unisom...

My question is, is it okay to take one every night?... 😫 I really try not to, but I just want to go to sleep! I’ve even tried Essential oils, I try and get up earlier than normal... I don’t know what else will help besides taking a melatonin.. it’s half off a 5 mg is what I take..