My boyfriend and I have been having unprotected sex for 2 years, and I am not on birth control, I cannot take anything with Estrogen or Progesterone, I have horrible reactions to it, and he always orgasms inside of me, and I have never gotten pregnant. He thinks he is sterile because as soon as his ex-girlfriend had sex with a new man, she got pregnant immediately, and we have decided that we want to have a child. I am 21 and he is 24, and we plan on getting married eventually, and we both want children but we do not know if it will ever be possible
Semen analysis or sperm counts depend on where you live. In the USA, fertility/IVF clinics, doctors, pathology labs, urologists. Try to phone your local hospital and ask them. There is even a home test (SpermCheck) approved by the FDA (buy from CVS/Wallgreens online) in the USA.
Very heavy flow should not be an issue. Having irregular cycles might mean that you will have to find a way to track your fertility and predict ovulation. There is a pretty good book Taking Charge of Your Fertility by Tony Wesschler, or look at the free education resources on fertilityfriend (dot com)