Can you instantly tell when your period starts?

Katie

About a year ago or so I read a post online and realized my whole life was a life. Every time I get my period I didn't realize that I did. My life has always been a gamble. However, in the post the woman was talking about how it's mond boggling that we can just be standing in the line at a grocery store and just get a look like in that's so Raven and we know.

I've NEVER known and I was just wondering if I'm alone on this or if just a person to person thing.

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