Why do kids under 16 get pregnant , give me your opinion?

Ive just being ready online (this happended years ago) a 10 year old egyptian girl fell pregnant and kept the baby , THAT IS SO BAD , i understand that yeh everyones doing it so why dont they , Im 13 and im not ually active , I also understand if your catholic and you dont beleive in abortion but if i fell pregnant under the age of 16 then i would get an abortion , i actually feel sick , i also red that a girl age 12 (one year younger than me) had a 20 year old boyfriend and he wanted a baby , she didnt but she did what he said , they even had there OWN flat and she was the one looking after the baby , how sick is that also , the programme underage and pregnant 2 twins , 1 fell pregnant the day after her 14th birthday and had it then 2 weeks later the other one fell pregnant , Whats your opinion x :)