Medical reasons only here. I think you have a legitimate need based on the kidney issues and keeping the baby off narcotics/reducing narcotics, etc.
The birth date/month things seem silly to me. But I understand that some people are more interested in things like that. With DD, my ovulation meter never said I ovulated in the month DD was conceived and with this baby, I never recorded my LMP the month we conceived. So, due dates are very much 'estimated' and I like the idea of baby cooking as long as needed.
But your kidney issues seem legit.
SAHM to Magnolia May (09/10), Luke Russett (04/13) and expecting 11/16. Wife and best friend to my airman.