And all you can do is your best PZ. I do totally understand your guilt (I went through alot of BF issues with my DD too, and I fell pg unexpectedly with #2 when she was only 7mths old, she weaned fully then so I do get your concerns) and I know it's easy for me to say, but try not to worry so much about it. Things change. Unfortunately it's gone down a path you didn't expect. You have done your best for her and I am sure she is perfect in every way. You are definitely not failing. Don't think the worst. She hasn't weaned, so you may be tandem feeding in 7ish months.