Yes it is normal.
Yes, it can be. If you are under stress this can cause missed periods. If you have been sick, on a diet, all of these things can cause missed periods. If you are young and just starting your periods it is common to skip months or to have irregular period. It takes a year or two before a cycle becomes regular.
no
yes, if it's your first time starting.
This can happen when you have taken the morning after pill or birth control pills and it can also happen when under stress or in the case of irregular periods.
Yep.
spotting can happen either before of after your period often it is dried blood if however you are worried then you should contact your gp.
Yes, 8 out of 10 women get bloated before and during their periods.
Yes, you can have periods and not have another for mouths its completely normal.
Twelve is a perfectly normal age to start your periods. If you're just starting, it may be a while before your periods settle down into a regular cycle. You may experience simple spotting (very light bleeding) at times and a heavy flow at others. This is normal for the most part, unless you have continuous bleeding for longer than seven days, in which case you should see a doctor.
Of course not. If you like to do that its fine.
No this isn't normal