Having trouble conceiving

I need some advice. I been try to conceive for the past year but Its just not happening. Eveytime AF comes around I get so discourage. My cycle is normal it come every 25-30 days. I dont know what's wrong. I went to my doctors in March and she check me out and did blood work and said everything looks fine. I am 24 years old and 210lbs do you think my weight and stress may be causing infertility.