SIL pregnant with us TTC what do I do??

Amber • Officially a momma to a beautiful baby boy and 3 pups 🐶 💚👩🏻‍🍼👶🏻
So my sister in law is pregnant ,YAY! 
We are coming up to a year after our loss and we had previously discussed using the Stork to tc if we hadn't by this year.... 
I'm so torn. I want another baby but getting pregnant again while my sister in law is just wouldn't seem "fair".  They have and still tip toe around me when it comes to their pregnancy which is really bothersome because I am finally in a good place.  I can appreciate their effort but it's more hurtful than anything. 
What if by the off chance we do conceive using stork ot mosie ? My first thought is to not announce our pregnancy till we are far long not to just let her keep the lime light but because I wouldn't want them to feel awful if we lost a second pregnancy while she's doing well with hers. 
Should we just wait till she's due? Or just go for it and keep our progress hush hush?