Honestly darl,
DF and I have just started sugar/coke & him: energy drink detox and feel like crap. When you are about to give birth, or have just had a baby it is not something you are going to want to put your body through. The first few days are so hard with bubs anyway, if this has been a regular habit for you it will be much easier for you to continue it . Maybe try buying the mini cans for the first few weeks and see how you go?

I think you'll be fine but breastfeeding is soooo different for everyone that it is hard to know! All the best with the impending labour and birth, and OMG look at you 39 weeks!!