trying for a baby

hello me and my bf trying for a baby but my period its not regularly and i don't know when I'm ovulation and its make it very hard for us and it's depressing ?, i thought this month i will maybe get pregnant but i end up with a lot of period, what can i do to help us to get pregnant? p.s One of my Fallopian tube is blocked but the other one is open so that's another difficulty I have to deal with.