Definitely that time of year! I feel like I add things to my SAD strategy every year, so...
Vitamin D supplements
Lumie lights are my total saviour (I have a big one for home and a portable one for travel/work) - cannot function without them
As much exercise as you can
Generally being accepting of yourself - if you can't manage all of something you usually would then do as much as you can and don't feel bad that you can't do as much in November as you can in July
Tell people - so much easier & eases the anxiety when you know you don't have to start from scratch to explain when there is a day where you just can't function. It can be really matter of fact - 'the lack of light means I have less seratonin & too much melatonin so I'm less happy and more sleepy', and then more detail for people who need to understand more (or send them here - bit.ly/2wt6sJ2 - has definitely helped people understand what I'm going through)
As much natural light if possible (if you work in an office and need to move to sit by the window, do it! if you can change your commute to include more light, do it - made a huge difference to me to not commute by tube any more)
Eat as healthily as you can - but realise that sometimes you'll just give in to the biscuits and that's fine (there is also research to say that SAD sufferers need more carbs, so I'm all over that!)
If it starts to really affect you, go to your doctor. I totally resisted until it got really awful and was so glad I did, I'm now on SSRIs Sept-March and they've made the difference between a few days a week where I couldn't cope and a few days a year. Maybe not for everyone, but I'd definitely have a chat with your doctor about it now in relation to the IVF so you have an idea up front of what to do if both become a stress at the same time.
I'm a bit of a SAD geek, sorry for the long post!!