R.J.
Everyone is different... But my 2 best friends nursed from birth to 12/13 months and both just shortly after there babies turned 1 thier periods returned even while still nursing.... I wouldnt be to concerned but if going to the doctor will ease your mind then by all means go! Hats off to you for nursing the full year and then some! my son is only 3 months and I am wanting to nurse for the full year so far so good!
R.