I know abortion is a sensitive subject, but you also have to remember that she came on here looking for advice, not to be judged and ridiculed. Everyone has their own opinions and we don't know her story, so maybe we should leave out the name calling and just try and help her as best as we can.
We don't know if it was an abortion or a miscarriage. Women in other parts of the world call a miscarriage an abortion and it's also medically known as one as well. Before everyone jumps on someone they should know the whole story and we don't.
Anytime you have sex, yes you can become pregnant. Unless you're trying to become pregnant, you should practice safe sex and use birth control and condoms.