To shave for wedding or wait?

Hi all, I was diagnosed with her2+ breast cancer in my right breast and 2 lymph nodes a few weeks back and started AC chemo last thursday (14/11/19) and my next round is on the 2/12/19. My wedding is on the 30/11 and I'm having a quandary about my hair. The cancer care team said my hair would be gone by my wedding day and I'm ok with that and will make plans for a wig for the day but I guess my question is, should I pre-emptively shave my head, assuming that it will definitely be falling out by then and commit to the wig or wait and see (get a wig in case but hold off until it actually starts to fall). As far as I can tell, wigs can be uncomfortable and itchy and I'm in brisbane where it is hot so I guess I don't want to have that added discomfort if I don't have to but, if my hair falls out on the day in large chunks I guess that could be hard to deal with at the last minute. I'd love to hear people's experiences with AC and hair falling out. And wigs. Oh, I should say I am not a very princessy bride so while I want to look nice on the day, it's not my major driving force. Thank you for any advice.