Girlfriend acted strange for one day? what is going on or is it my imagination?

One day my girlfriend decided to wear sexy makeup to work (she never has before or since). I was like whatever but that day she also came home 30 min later than usual with no explanation, wasn’t wearing any panties, and had some white stains on the inside of her pants. WTF? Is it my imagination or should I be suspicious. I asked her she says I’m being crazy… Am I?🤔
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What doesn’t make sense is this is the only time anything weird has happened. And where does she find the time? 30 min max. That’s nuts if she just getting side quickies.
Girlfriend acted strange for one day? what is going on or is it my imagination?
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