irregular period,pain in the stomache with cramping,light pe

hi!
I'm 29 years old.after 5years of my marriage now I want to be a mother.last 2 months I &my husband tried. this month I i got my period at the same day of other months, but it looks different. 1st day it was licht brownish.and too light. even I didn't take napkins. but 2nd day it become darker. and little bit redish.but not so heavy . last few days i feel some pain in my left brest and also a little pain in lower stomach and almost all time i have a lower backaches. last month I got normal peroid. but before last month i didn't get the period.
one and half years ago I had irregular periods. i did some hormonal tests(as my doctr said).My doctor said I have some hormonal imbalance.and i had to take some medicine (6monthes course).after that it was ok. but now Ilast 3-4 monthes I noticed it become again irregular.and as I said before last monthes I missed period.
can sombody helps me?am i pregnant now?