I assume the person asking if she could be having twins meant bump not number.
I'm almost 32 weeks and can still push my bump out slightly, and if I do the carys pose it makes it even bigger
When you watch their videos, if she's just walking around or sitting etc it doesn't seem as big as when she films a bump update or does her insta stories/posts, so reckon she is still insecure and wants to be sure everyone knows it's pregnancy, but I'm guessing when she greets new people it's "hi, I'm pregnant", not "hi, I'm carys"
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Would also find it a bit insensitive if she does end up having twins to shock announce it for more views, she's milking the pregnancy enough, and you know she will have loads of videos planned on why they kept it a secret if it is, but I do think she is just having the one