In twin Pregnancy,can the 2nd baby vanish after the 12 weeks scan is confirmed and said that I have got twins?

In twin Pregnancy,can the 2nd baby vanish after the 12 weeks scan is confirmed and said that I have got twins?
I have got this fear that I'm carrying only 1 baby because of several reasons.
I read about the vanishing twin syndrome. is it possible to have VTS after the 12 week scan is confirmed and the docs told that I have got twin babies.
I have got very tiny bump and I'm 23 weeks pregnant.. i was size 12 before getting pregnant and I still fit in my normal clothes I haven't bought

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