My period was really short this time, I  got like one day of cramps, a really light flow, and it was two days shorter than usual. But I'm in a really bad mood and I don't seem to know why. I'm being snippy with my boyfriend and I just feel angry all the time even though when I stop to think about it, I'm not in a bad mood. I just feel pissed off. Does that make sense? I don't know what's happening or if it's my hormones. I've had a busy weekend so it could be I'm just tired but does anybody know if moods and shorter periods correlate?