Looking for some realistic answers please

Hi,
my issue is that i have very irregular periods.they are usually a good 45 days apart. I am young but married and have one child.In october 2010 I got my period but didnt get it in nov,then in dec i got my period dec 10-16th.well tomorrow will be day 63 since my last period started back in december.I have taken a pregnancy test but it was NEG,so i dont know if it was too early or if im just not pregnant.I am emotional lately and have gas and eat all the time,but there are other things that could cause these issues. im just so confused about weather this is my irregular system or if we are having another baby.Whatever the outcome may be,we are ok with another child.We arent doing anything for or against it,just being us.Please comment.THANK YOU