Girls, Can someone explain my friends period to me?

Anonymous
Not in a I don't know what periods are sense, but I have a friend who's a friends with benefits and we had sex last week specifically Tuesday and Wednesday because I stayed at her house while her parents went out of town. I accidentally came in her, not a lot, but I did.

She always tells me about her periods and said it started on time, but it only lasted three days and the entire three days it was extremely light. For instance she usually complains about being soaked in blood of she forgets a tampon, but said on the second day she ran errands for three hours and didn't realize she wasn't wearing one until she went to change it and her in lady garments were fine.

But she said don't worry because she has a weak period (whatever that means because she says the bleeding is heavy) and she went to a Friends for two days after that and two girls were on their period and she said they just threw hers off and it happens often.

My overall question is did her friends throw her period off (she has complained about having two periods a month [one normal one short] when she stayed at a friend's every weekend for four months) or should I start praying to every religious God for a boy?

Girls, Can someone explain my friends period to me?
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