Suggest Ways For Conceiving While Having Irregular Periods

First I had periods irregular(once in three months) them I used medication n got married.after marriage for 6months its was regular(for 28-30 days).and now again my periods are irregular and now I am using regesterone along with glyciphage(metformin SR). After marriage we are not in relationship but only one or twice in a month. I want to become pregnant.will my medication regarding this irregular periods affect my pregnancy. What are the suggestions for me to become pregnant