This is a very good question. It took us 7 years to finally have DS, who is now 5. I wish it had not taken so long, but infertility is not for the faint of heart. By the time he was born, DS #1 was about to turn 12! So, yes, so much for the fairytale of having two children who play together all the time and share similar experiences. I would love for DS #2 to have a younger sibling from the frozen embryos, and I have thought long and hard about a 5.5 year age difference. I am 5.5 years younger than my oldest sister and she is my main champion during this decision right now. I love her so much! Although I may not have been super close with my oldest sis when we were children, I sure don't know what I would do without her now!
I feel as if I will regret it if I do not try. It will haunt me forever. Everytime I see moms at the grocery store with two children a few years apart I long for this. It would be amazing if one of our embryos were to become another loving member of our family. As my OBGYN said, they are just there (in the lab) waiting for me! She is not the doctor who would be transferring them, she would just be my OB, but she is all for it! I was afraid my docs would warn me against this decision to try to become pregnant, but I left both docs' offices feeling more and more as if this is the right thing to do in our life and for our family. I don't feel my family is complete.
My teenager does have a different father, and he spends a lot of time at his father's house lately since his dad just broke up with his gf. We live in the same neighborhood, about 5 minutes apart. DS #1 has a job and will be a senior in HS next year. We have his college plans all laid out and the money is saved in a 529 college savings plan. My ex is very attentive to his needs, as am I.
The answer is YES, I want another child very much! I have about a 50% chance of 1 out of the 3 remaining embryos becoming a full term pregnancy. I have been down the infertility road so much, though, that if it is not meant to be I will be sad, but not broken. However, I will have regrets if I do not try.