Could You Stop Taking Finasteride If You Plan to Become Pregnant?

This is the directions I have been giving patients up to now:  “You can stop the drug one week after your wife starts her period for a period of 2 weeks. If your wife has a normal 28-30 day cycle, then she will ovulate when you have a zero finasteride blood level, yet maintain enough finasteride in your hair to prevent withdrawal hair loss.”

UPDATE: Now there is some evidence that finasteride does cross into the uterus so the drug may not be safe, see here:  https://baldingblog.com/more-on-finasteride-risks-in-pregnancy-from-reddit/ and here: https://baldingblog.com/responses-from-finasteride-can-cause-birth-defects-post/