Thinking of baby 5*

Im 32 year old just renew our 10th year wedding vows and have a 15 Boy , 13 girl, and 8 , 4 girl ..my hubby is not the biological father of my 1st baby boy but he being in my son live since he was 7 months baby  that his really dad ... We being trying for a other boy just because i will like my hubby to have one of his only but no luck lol .. Is this crazy of us think of baby # 5 .. I know I will hear my family say so much but I thinking about and have the feeling like I should just do it