Re: why is my period shorter
It could be you are pregnant. If it's been going on for a couple of months, the test should be reliable. It'll cost you a tiny bit of money a take a few minutes, then you can either know and deal with it, or stop worrying about it.
However, sometimes a woman's periods change. When I was a teen, my periods were several days of fairly heavy bleeding, now it's only 1-2 days heavy followed by a few days light. It doesn't seem that there's anything wrong with me, it's just the way things are now, so I'm not worried.