I know exactly how you feel! I posted in the Weaning forum because I was feeling guilty (and definitely sad) about weaning ds. If I hadn't gotten pregnant I would have kept nursing him - he really enjoys it and, despite his teething, is still a pretty enjoyable experience. He has not been happy about his morning session being "cancelled" and I'm almost wondering if it would be better for me to have dropped the am and pm (pre-bedtime) sessions altogether but... you should see how excited (almost desperate) he gets when he realizes that it's time to nurse! I feel as if I'm taking away his joy!
(great... now I feel like crying.)
I know I can continue nursing him if I want to but I really don't want to tandem nurse once the other one is born and, not to mention, it's a bit uncomfortable with my belly getting bigger. On the other hand, I realized today that, as soon as I completely wean him off (I'm aiming for the week after his first birthday), I can wear my "regular," non-nursing bras for the next 3 months!!!! I can't wait!!! Oh, the joys of motherhood.