SIL miscarriage- advice needed

Samantha
My SIL and my brother found out yesterday that she's about to miscarry.  They are obviously devastated.  I'm currently 33.5 weeks pregnant with my first baby.  Before this pregnancy I had a miscarriage at 10.5 weeks, so as much as its possible I have a good understanding of the pain and sadness they are feeling.
I'll make it clear that I'm close with my brother and SIL, and despite the news are trying to be excited for me.
I'm wondering if anyone reading this has been in my or my SIL position?  If so, what things are helpful and not helpful?  My family will celebrate my baby and I know they would feel awful if we didn't because of their loss.  I know how awful a miscarriage is and I want to be sensitive to them as it will still be less than 2 months from them loosing their baby and me giving birth to my boy.  
Is there anything I should be mindful of or do/not do?  I do plan to talk to them and my mum but was interested in others experiences and what helped.  To make it slightly more complicated English is the second language of my SIL (good English but when stressed or upset can struggle to find her words) and she lives in another country to all her family.  
I really want to support her but not sure if my upcoming birth will hurt her? 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors