Is it ok to wear a fancy dress when you are on your period?

I have a formal event to go to at the end of the week and i count the days and it seems I might be on the second day of my menstrual cycle and I knew about the the formal for months and all and got the dress and a little scared if it will fit while I’m bloated just want to know what all of you think of it
Is it ok to wear a fancy dress when you are on your period?
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