I'm on slimmingworld and also breastfeeding.
I since i am EBF, I can have 4 HE A and 2 HE B. Is as also advised to use all 15syns per day or at least 10. I'm on week three and I'm 2lbs short of loosing a stone!!
If you go, they give you a booklet for pregnant and bf slimmers.
Good luck x