I'm sorry you and your family are having to go through this

I've only had an early loss (8 weeks) but I know how difficult it was to deal with pregnant people, especially as like your sis, I wasn't even allowed to try for a while. Not being able to try for another bubba is like rubbing salt into the wound. Not even having hope to hold another baby in your arms.

I am guessing she probably thought you would stop trying out of consideration for them, even though she said not to "stop living your lives". I know I would expect a sister or close friend to at least wait a little while, even if that was unreasonable.