When I was 12...and I started with pads, and bled pretty heavy. One day at the end of the school day I realized there was an overflow so tried cleaning up in the bathroom as best as I could but the flow was heavy and wouldn't slow for anything so had to have my mom come get me because I was far to embarrassed to walk to the bus like that...and would have got blood all over the seat and yeah far worse then finally admitting to the office lady I had a feminine accident and that is why I needed them to call my mom to pick me up.
I think during this same period I also just randomly passed out one evening I was hungry waiting for dinner and standing in the kitchen watching my brother or sister show me something on the computer and just blacked out, woke up on the kitchen floor with the ambulance there. But yeah they could not find an exact cause of me passing out and said it may have been the combination of my first period, the heavy flow of it as well as maybe going too long without food.
I have to say I certainly prefer tampons, but initially the prospect of sticking them up 'there' was gross to me but eventually got over that because sitting in that period stuff during class wearing pads was even grosser to me.
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We won't go back.