I had the same thing through both my recent pregnancies. Dd#1 didn't wean in spite of it, dd#2 did wean during my third pregnancy. I still feel guilty about how I felt about nursing when pregnant and tandem nursing. I envy women who talk about how wonderful it is to tandem nurse, as that was not my experience at all. However, I did it for dd#1 as she would not wean.
As for dd#2, who weaned when I was 6-7 months pregnant, I often wonder if it was clw or not. I guess it was, but she would not have weaned had I not been pregnant. Maybe if I"d enjoyed nursing when pregnant, she would not have weaned either - maybe she got the vibes that I was not happy with it, although I tried not to show it.
I don't know if I"m being much help, but one thing that did help me was to focus on the fact that I was giving them a wonderful gift of a sibling. When I see my children playing happily together, or cuddling in bed, I can feel comfortable in the knowledge that when and how exactly they weaned is not important. Given the choice, I'm sure that they would choose to have each other, not an extra few months of breastfeeding.
If it is affecting your relationship with your child, sometimes I think you need to think about letting go of your ideals and gently weaning. I do sometimes wish I had done that with dd#1. It definitely affected our relationship for a while - eg I didnt like her clambering onto my lap for a long time as I dreaded that she'd want to nurse, and it was soooo painful. I'ts a tough situation, and I've been there - twice! THere is a place imo for following your heart and letting go of what you had 'planned'. With chidlren, not everything can be planned for.