Hi, i am on the other side (female on 6mp). We had to go the fertility route due to early losses, chemical pregnancies, and poor egg quality (none related to meds, as i was not dx at that time).
Through all our research (over the 3yrs of ttc), i had heard that there was chances of low sperm counts for men on 6mp, but had not heard about actual birth defects. I can say that i took mine through the ttc and development stages and my 1yr old daughter is perfect.
My only recommendations would be
collect sperm/freeze before he begins (which u mentioned u were already done)
possiblly meet with a perinatologist (high risk pregnancy doctor), who can disucss how the med might affect your pg.
2003, dx moderate UC
2000, dx selective IGA deficiency w/ anti IGA antibodies
2000, dx Antipholipid Antibody Syndrome
1999-current, chronic hemmoragic ovarian cysts, w/ partial ovary removal
1977, complete reconstruction of foot after lawnmower accident (chronic pain)
6mp 75mg, prednisone 40mg (just starting meds again)
percocet 5mg 3x day
potassium 3x day