Most likely just an irregular period.
you will get your period when you start taking your "period" placebo pills in your pack
you should put in a tampon and wear a pad in your underwear
sometimes it just happens... :/
This sometimes happens with birth control.
Yes it happens to me ever shot round
You start to ovulate and get your period back and you can get pregnant again.
You should not be pregnant when you start taking the pills as you start taking them within a week of the start of your period and if you have a period you are 99.5% sure you are not pregnant. However if you are pregnant the pills will have no effect.
Girls can possibly start there period when there 11 or 12. That's a phrase of puberty or a process of " dirty " blood to process out of you body. I'm 11 and I started my period Happens 1 or 2 times a month To me 2 time happens
When you first start your period you might have a little discomfort but it only lasts a couple of days with some bleeding of course.
Mostly when you feel like your underwear is getting wet a lot. If that's happens you might want to start getting ready for your period. It happens all the time. Even the first few days when your not on your period you'll start getting cramps in your stomach! Don't worry your just turning into a woman!
If by thirteen, you've started your period, then yes. But, you can get pregnant before you start, but that very rarely happens.