Girls, About girls period?

I had date with my coworker yesterday. We had great time, confessed to each other and we even kissed at the end, she texted me that she had great time. However, today in work she seemed to be keeping distance to me and kinda acted like a stranger. She never responed my text or call after work too.. She did tell me she feel very tired, and I know she’s on her period. Can girls be like this after we had such great time one day before? I am concerend.

Girls, About girls period?
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