Can you tell if a close female friend is on her period?

I was hanging out with a few guy friends that were visiting my city for a couple weeks; taking them around and sightseeing. I’m generally not a moody person & we had been having a great time every day we all hung out. Then, I took them out to this restaurant, we had some food, went for a walk & ended up at this sports bar. Shortly after, I felt my period symptoms kick in; the grogginess, cramps & pain. I rested my head on my bag that I put on the table & they asked if I was ok. I said yeah but I’m not feeling 100%. They asked if it was the food & I said no, I don’t know why. Then, one of the guys asked me a question & I gave a very dry response. They also noticed that I was yawning a lot & said that I seemed tired. I later popped some Tums in my mouth & tried not to look uncomfortable. Later, I went home & sent a text apologizing for my vibe being off throughout the day & told my guy friend that I was in a lot of pain & knew what was wrong, but just didn’t know how to tell them. He said he understands & said he hopes I get some rest. Do you think that they assumed I was on my period, but didn’t want to be rude?

Can you tell if a close female friend is on her period?
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