Thoughts on Melatonin when TTC or pregnant ?

Wondering everyone’s thoughts on using melatonin while trying to conceive . I currently have bad insomnia & melatonin is the fix for me , but I’m curious if anyone with reason think it can be bad or affect TTC or pregnancy . I figure once I’m pregnant I won’t have bad insomnia in the beginning at least since it usually makes you super tired in the first trimester. For now I want to use it since I have a hard time sleeping , but I am worried it could be bad for TTC.