Yep thats part of why Ions are one of the 7 sway factors. Moon phases affect egg polarity. There are some studies on moon phases and gender in the FAQ. This is also an explanation from the FAQ:
Positive ions favor boys Negative ions favor girls
Spring has slightly more - than +
Summer has more - than +
Fall has slightly more + than -
Winter has more + than =
Full moon (from the day moon is full till day before new moon) has more +
New moon (from the day moon is new till day before full moon) has more -
So if you ttc in winter on a full moon this strongly favors boys. Summer in new moon- strong girl. Spring in full moon is more neural
NOT EVERYONE IS EFFECTED BY IONS IN THIS WAY! You know if you are by your pH. High pH favors boys and indicate egg is in polarity for y sperm. Low pH favors girls and indicates egg is in polarity for x sperm
FYI though, both my boys were concieved in New Moon phases. So clearly I am one of those who aren't affected much by it.