It is okay to cry, and I am sure people would understand if you did. Just make sure you have a tissue with you and try to smile through your pain.
I hope you both feel better soon, there is a reason for everything and sometimes only God knows the reason. God chose to take your child back and for that you should not cry. But the loss of a child is painful and why? is always a question.
I am probably not being very helpful, but I wanted you to know someone out there feels your pain and wishes you well.
Best wishes to you both Linda