What Causes Infertility Having Normal Periods?

hi i m 26 year old.2 years back i got married.before marriage i had oral sex with my husband .i used to enjoy it but after marriage i dont enjoy intertcourse n oral sex. i m not getting pregnant now.after marriage he used condoms for 4 months, i was having frequent urine,so he stopped using it.i want to conceive now.i have regular periods.,plz help me.