Work and trying to do IVF

So we have a work retreat Feb 7 and 8 which of course co insides with my possible ER and ET dates. It is so frustrating. I can't tell them for sure if I am going to be there and I really don't want to explain why. We are also asked to stay over -- which really isn't a possibility for me unless I have a fridge in my room and a volunteer to give me an injection in my behind. My boss is very good about it all but I just feel so frustrated that I don't know what I will be doing those days.