Tax Return

So we got our tax return a couple of weeks ago, and we do have enough money to do one round of IUI. My questions are: is it worth it to just do one round? Are we wasting our money? Should we instead just put the money to go use for the two beautiful blessings we already have (even though I know they would LOVE LOVE LOVE another sibling, they both talk about it all the time!)? Then their is always putting the money towards another adoption- obviously not with the agency we have used in the past because of the cost. UGH!!!! Where is the crystal ball when you really really need one! I know we need to make a decision soon, and just have faith in our decision and in God's plan but as you probably know that is sooooo much easier said than done!
On another note, my A1C is awesome:) The metformin is apparently working to some degree because I had a period although it was like 40 days between my last one and this latest one, and I don't know if I ovulated at all. So I really don't know if it was a success or not, but I am continuing on the medication in hopes that it will help.
Sorry it has been a while since I have posted, not much going on in our life in the way of expanding our family:(