I got my period while hooking up with coworker. MORTIFIED. What do I do?

I didn't find out until AFTER the hook up. We work in a tiny space together. We acknowledged each other the next day and pretended like nothing happened. I'm still mortified but will be seeing him again in a couple days.

Should I just keep my mouth shut or casually and briefly bring it up and ask if we're cool? I hate this feeling!
I got my period while hooking up with coworker. MORTIFIED. What do I do?
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