What Causes Fungal Infection And Weight Gain While On Medication For Infertility?

hello doc,i have a boy who is 3 and a half years old,after childbirth within 5-6 months i started gaining wait and within a year my periods stopped,and took a course of hormonal medicines after which had a series of fungal infection,now am on infertility drugs like folvite,glycomet,letoval and duphaston.m having fungal infection again and have gained a lot of weight as well.can this be due to the medicines?