I am seeing fertility specialist &she did clomid (clomiphene) check(found ok) monthly.but my periods have become lighter after i started taking clomid (clomiphene).plz advice

No big worry: I suspect that you have nothing to worry about. The obvious concern might be a thin endometrium but this is not too likely. Your doctor can check with an ultrasound. If the lining is thin mid-cycle then change medication or add estrogen or possibly even increase the Clomid (clomiphene) to make the ovary produce more estrogen. Many options. Best wishes.