Hi my dad was diagnosed terminal lung back in 2013, my now wife and I decided to set a date shortly after we found out for the following October in the hope that the year he was given would be true. At the time he was on a break from the chemo and instead was having targeted radiotherapy on a secondary tumor in his brain. He was borderline wheelchair bound but was well enough on the day and created one of the best memories I hold dear to of him being raced across a field by my brother as the heavens decided to open.

You are entitled to keep to your decision to bring it forward. Your mum is worried about not feeling well enough to attend but maybe try explaining to her that she isn't expected to stay all day if she isn't 100% on the day. Even if she is just there for the ceremony that's what truly matters to your and your fiance. It's great news that the surgery went well and she is recovering but remember it's your day. We all want it to be special maybe try explaining your reasonings with her. Steph's reply has a good idea regarding possibly going with your mum and speaking about the possibly effects chemo could have.

I hope you're mum makes a full recovery and wish you and your fiance all the best for your wedding