I have pcos and trying to get pregnant.. however..
I have been feeling different
Light headed, craving things I wouldn't normally crave.
"Periods" (I don't have regular periods... normally 1-2 a year)
Since August I have had some minor bleeding... not much... but each month since
I have had some bleeding plus I feel I am gaining weight... I have taken a pregnancy test at
Home and it is negative. What else could this be?

You could always see your doctor about having a blood test done for pregnancy to confirm for sure one way or the other. The irregular bleeding and weight gain can be part of the PCOS, even if you haven't had it before. Best to rule out or confirm a pregnancy and go from there.