I had a termination just over a week ago, the friday before last. My baby was also 6 weeks old.
I spent two weeks thinking first yes, then no, then yes and then no... My thread is on mumsnet if you search under mostdefinitelyconfused.
We have two kids, youngest just started school - it was more that life had just got easier and I was afraid that our lives would implode if we had another one as the last 6 years have been so tough.
I don't feel guilt or regret just relief and have started to try and sort out all the things that stopped us having the baby. I am sure that I will feel all the emotions that you are feeling especially when we get to August next year. I have blocked all the mumsnet ante natal threads and post natal threads so that I don't have to read about other peoples happiness.
For us it was my marriage and our existing kids that I made the decision for. That is how I have justifed my decision.
Inside it feels quite similar to the miscarriage that I had - a bit physically and emotionally empty.
I feel sad that I wasn't in an emotional position to proceed with the pregnancy. But most importantly I have decided to forgive myself because otherwise it will eat me up inside.
Big hugs, be kind to yourself - allow yourself to grieve. Just because it was you who made that decision doesn;t make your pain less valid or wrong.