2 1/2 months late on period?

I'm a 22 yr old women with 2 children and happily married. 2 1/2 months late on my period. But several negative pg test. I have a few symptoms like fatigue, mood swings,increase of apetite. But still not sure. I had a bby almost 9 months ago and was thinking maybe my hormones are still crazy. I had regular periods after son was born then they just stopped. Need some answers(: no negativety I will report you! Just tryin to see if anyones been thru this?