Hello,
Our DD's are 2 and under 1. Our elder DD was placed with us and before the adoption order arrived we discovered I was pregnant.
We had been through many years of IVF and had been told, even with the most advanced treatment we had less than a 5% chance of a live birth. After much heartache we decided to adopt. It has been an amazing and wonderful experience. However, not without it's challenges, our daughter was under a year when she came to us, and due to the circumstances around her birth needs more than a birth child would.
Finding out I was pregnant was a delightful shock. Throughout the pregnancy I had a lot of concerns, about our 2 children.
In regards to your question, I would make the following points;
I would not manage to have IVF and care for our adopted daughter. I would have struggled with managing my own emotions whilst dealing with a hurting child. It would have compounded how hard I found IVF and I would have found it exhausting.
I did struggle being pregnant and caring for a child who needed me, it was an emotionally tiring time and I was torn emotionally between my children. For example my elder daughter needs to be held and carried all of the time and during pregnancy I did not have the physical strength for this. She also lashes out and kicks, this was hard to deal with at the same time as being pregnant.
Now both children are here I often feel torn between my 2 children. They have very different needs, physically look very different (which is relevant when we attend baby groups as we are not disclosing DD1 is adopted to people we meet). We feel a need to balance the needs of both children all of the time. I know all parents of 2 young children feel this but I think it is magnified when a child is adopted. For example when DD1 hurts DD2, we need to bring DD1 in close and support her using PACE techniques (look up Dan Hughes) but at the same time comfort DD2.
We would not change anything, but we did not plan to have a birth child after adopting. I would suggest that if you do want to have a birth child, or are even unsure at the moment I would resolve this before adopting a child.
If you wish to know more please send me a PM, sorry for the long post.