Girls have their period once a month for as long as their body needs too. The start it about at 10-13 years old and quit as an adult.
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You probally just have eregular periods its ok.
You have a 1 in 2 chance of having a girl. No matter how many boys you have had in the past or how many girls you have had in the past, each pregnancy presents the opportunity to have a girl or a boy with a 50% chance. The sperm does not know that it had already produced ,say, 5 boys and needs to produce a girl for you and your partner. So with every pregnancy there is a 50% chance you will have a girl and a 50% chance you will have a boy.
data collected over several time periods is what type of data?
a hard stomach and twin periods in one month mean you have twins on board.