Why is it when I'm feeling down and not in the mood my sister gets upset with me?

I'm 9 months and I'm already feeling contractions. She gets upset because I was down today and didn't feel like being social. I slept most of the day. My mom does the same thing. She gets upset. But if they are down I'm there for them. My sister broke down I was there. Now she being dramatic giving me attitude. I don't take it personally if they are not feeling well. Would this be considered toxic to be around? It just makes me feel weird.

Why is it when I'm feeling down and not in the mood my sister gets upset with me?
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