I got my period 3 times last month. Should I be worried?

I got my period on the 3rd last December. I was suppose to get it on the 6th. It completly stoped like around the 11th. I get about 2 full days worth of period every month then I get little dropps for the rest of the days. When my period starts it takes at least two days to get regular (full) flow. Then again on the 19th I saw some period like spotting. It was very light and lasted only one day. Then on the 29th I got it again. I am still having it right now. Is there something wrong with me? Do I have to see the doctor? My mother said it is stress. But I have nothing to stress about. I am happy in my life right now because things are going good for me. My co-worker asked me if I am pregnant. I am pretty sure I am not. I am young and in my 30's. I was affraid I might be getting early menapause. I hope not. I am looking forward to having children in my future. Should I go see a doctor? Is it normal to get periods like this?