Women being distant while it's that time of the month?

Been seeing this girl for a couple of months. Last week we were cuddling and kissing and all kinds of lovey stuff. We would text a good amount. She's been telling me when she gets her period, and last week even asked me to rub her hips to help with initial cramps. So I know this week she's on her period.

This week she seems a little more distant than usual, going from day long conversations to essentially checking in and chatting every couple of hours. This has happened before around the same time of the month. Not that I'm tracking her period or anything, but I am seeing a pattern.

Is it normal for women to be a bit distant while on their period? I have a bad habit of overthinking and I've been worried I've done something wrong, but it seems like a logical explanation that she's just not doing too well right now, and I'm just wondering if this is a thing.
Women being distant while it's that time of the month?
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