Wow, that is exciting!

Hun, there are many circumstances in which it is possible to do IVF cycles while bfing. As with any other medication, the information on what is and isn't safe while bfing is not well known by most doctors. There are pharmacists and doctors with an interest in it and access to the latest mediations databases. As a starting point, you might be interested to listen to a podcast by an ABA counsellor who has been through IVF while bfing, after doing loads of research into it. I'll post the link here in case you'd like to listen. If you would like to contact her to ask further questions you can send me PM with your email address and I'll pass it on to her. Here is the link: MumsRight Podcast (scroll down to talk number 22 in the grey box on the right).

WRT tandem feeding, the milk changes to colostrum at some stage during the later part of the pg and stays like that until your milk comes in after the birth. The colostrum is still really good for your toddler although some like it better than others, and sometimes their poos get runnier at this time. Having a toddler to help drain your breasts in the early days is fantastic for reducing engorgement. It can also help the toddler to transition to the new family arrangement.

All the best with it all hun.