Focus on what you've gained and forget what you've lost (meaning the chance for some frosties). I think that is the best way to live in the moment and to experience the true happiness that you should be feeling right now. All the best to you and the little ones! Oh, and high five the hubby for me!
Coincidentally, I am on the z-pak as well (my 2 year old passed on a bug to me...my husband and I have been talking to him about sharing, so maybe...) but I am in the stage of synching up with other recipients for our cycle (which I still haven't heard from the RE when that will be). I can tell you that I get bronchial infections from time to time, and I had one when I was pregnant with our little guy. My OB-GYN told em that it was not good for the baby if I wasn't well myself, and he prescribed a z-pak, which I took, and all is well. I know it was not during the dreaded 2ww because this was before our fertility issues popped up, but almost any pregnant woman is concerned about what she puts into her body. I also know on the road of infertility, we want to do EVERYTHING that we possibly can to not mess up our chances of getting pregnant, maintaining a pregnancy and delivering a healthy baby.
Take the meds and feel better soon!