The thing I always tell moms is to do your best, with your heart and brain, and then, no regrets.
Life is to short to go back and dwell on the what ifs.
I assume you have a happy healthy child?
Many women would love to have this and never will.
You have a lifetime to enjoy with your son. Do not waste energy that could be used for him.
Our daughter has just graduated from college. She is an only and my husband teases, we should have had a bunch of these, she turned out so great! I told him she turned out so great because she was an only and we had the energy and money to do things, give her experiences and not be stressed about multiple children....
Of course we would have loved any and all children, but we have been very fortunate and I fel live a very charmed life. No regrets!