That is actually not uncommon. Activities which are out of the ordinary or stressful, whether it be school camp or exams or upheaval at home can often cause your period to come early if you are not on the pill. It is also a prime time for a first period too.I just realiesed.. I had school camp one week and we got back on Friday.. I had my first one the following Sunday.
I was 2 Days close to getting it at school camp >.<