How would you react if you woke up and the bedsheet was soaked in quite a lot of blood because your girlfriend's period had started?

Imagine you've recently started dating a girl, you don't know each other too well yet. One night she stays over at your place and when you wake up there's a lot of blood on the sheets cause her period had started unexpectedly. She's extremely embarrased and upset. How would YOU react, guys?
How would you react if you woke up and the bedsheet was soaked in quite a lot of blood because your girlfriend's period had started?
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