Did you conceive on a full moon or new moon? And is your due date on a full moon or new moon day?
I conceived on a full moon day and I'm due on a full moon. Boy?
This study suggested a relationship between moon phases and baby's gender: pubmed.ncbi.nlm.nih.gov/16295726/
Lunar calendars were also a big part of imperial Chinese households and used to help plan gender of babies.
go.gale.com/ps/i.do?id=GALE%7CA671306936&sid=googleScholar&v=2.1&it=r&linkaccess=abs&issn=23201770&p=HRCA&sw=w&userGroupName=anon%7Eff2db7f7 This study suggests lunar calendars aren't evidence-based for determining gender.
I'd love to hear anecdotally from people who are pregnant/who've found out their baby's gender already. You can go back and look at your conception day if you have a period/fertility tracker and google what the moon was doing then. I'm only 9 weeks along so won't know for a few months yet...