Is it nasty to have sex during your period?

I have heard many different people say that its disgusting and some say its ok....which is it.....and also if you have sex on your period without a condom can a girl still get pregnant?
Update: aalso refrain from rude comments its just a question no where in my question does it say I have or was thinking about doing so......just curious and felt like asking different people around the nation thank you!
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