Hi. If no abnormalities were observed, then it could just be pure coincidence. Make sure you are active, but not overactive physically, take your pre-natal supplements at least 3 months before starting conception and accordingly during pregnancy as well. Chances are always present, but yours will be a complicated pregnancy purely because of your age. Get your hormone levels checked, and if all is well then there should be absolutely no assistance required for you to conceive either. Best wishes.