First Timer!

Not to long ago, I visited my OB and I asked about getting pregnant. My fiance and I have tried "our" way for over 5 years. My doc told me I need to start taking prenatal vitamins as well get an ovulation test. Lab tests for me are good just need to make sure I am ovulating correctly. As for my fiance who takes Humira injections each month. (Has rheumatoid arthritis since the age of 16). Could his condition and medication cause infertility in him?