Yea. Especially if you're young. It can also be due to the change of environment. It can also match on the same day as the person you're living with. When i started living in a dorm, after a few months, my roommate and i started getting ours on the same day.
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If you are still young and have only just started you periods, it is nothing to worry about and is normal as your hormones are still regulating. If you have had regular periods in the past, it is important to go and see your doctor or gynaecologist. The chances are that it is nothing serious, but it's best to get checked out sooner rather than later. If you have never had regular periods, but have been having periods for a couple of years, it's also important to go and speak to your doctor, for the same reasons.
No I wouldn't say normal but there is a condition where that can happen you should ask your doctor
It depends, because every person is different.
But it is usually not normal. If you go longer than a month, then you should probably either get a pregnancy test, or go see your doctor.