Praying for baby #5!

I'm 39 and have 4 beautiful children! Our son is 20 in the army! We have daughters 16,12 & 10 yr old. My husband and I have been trying for 6yrs. Went to a fertility specialist and spent lots of money with no results. We pray that God bless us with baby #5, I think we are going to have a hard time accepting not being able to conceive. Please keep us in your prayers! Thank you