Just because your sister is grieving, it doesn’t mean you should be made to feel shit for being excited about your baby.
Of course your sister will feel upset and everyone deals with miscarriages differently, it doesn’t mean that she can’t manage to be excited for you and supportive.
I had a miscarriage last year, my baby would of been born 2 weeks ago. Yes the due date stirred up all the grief again, but did I shut myself away and act pissed off and not happy for my friends who had just given birth? No, I didn’t. I saved my sadness till I got home. Just because someone is grieving, it doesn’t mean everyone else needs to be miserable.
I understand everyone grieves differently, but if your sister is acting like this 9 months on from her MC, I don’t think she should be trying to conceive again until she’s had a therapist to talk to as she clearly can’t try and come to terms with the loss.
She needs to realise that although it’s awful what she went through, the way she is acting now will make her burn bridges. When she does get pregnant, she will expect everyone to be happy for her, but why should you when she couldn’t pull her head out to just act slightly happy for you?
Just ignore her and wait until she comes around.
Also, @StepAwayFromGoogle making out that OP has everything perfect right now and everything is fine for her and not her sister is just pure shite. You don’t know what will happen with op and whether the baby is going to completely healthy or not, she hasn’t given birth yet? You don’t know what difficulties they are going through/ if they have had their own fertility troubles. Just because the sister miscarried it doesn’t mean the world stops for her and her grief. It’s awful miscarrying but you can at least TRY and be slightly happy for the ones you care about or don’t expect anyone to give a shit when you are finally expecting.
OP, just leave her be, enjoy the rest of your pregnancy and don’t feel you need to walk on eggshells around her. You’ve been more than supportive enough and if she can’t see that, then that’s her issue that she needs to work on. Wishing you all the best for the rest of your pregnancy and birth 😊 x