Kindey transplant and its meficines alter the hormonal
status of individuals resulting in abnormal periods and may be inability to conceive.
You have not mentioned what drugs are you taking and in what doses.
However normal periods and pregnancy
are possible after a couple of years of transplant.
You should consult a gynecological endocrinologist
and get your hormonal workup done but any medicine prescribed should only be taken in consultation with your nephrologist
Regarding the current problem with periods you will require menstrual regulation with small dose hormonal preperations in consultations with both gynecologist and nephrologist.