Suggest Treatment For Irregular Periods

Am 27 yrs old girl, after 6-7 months am going to marry. My problem is from past 1 year am not getting proper and regular menstrual periods. Its about 2 days period but with very very low blood flow or sometimes like a spot only. Although I have done 2 USGs also at different interval of time, its all absolutely perfect internally but still my Dr. did not found any treatment for me. My stomach or tummy also increased due to this problem. I exercise regularly.

Can this create any problem after marriage to conceive ???

I am so worried about this, plz help me out.