My period only lasted a few hours

I'm usually irregular, but I have been kind of steady for the last few months last month I was a week and a half late, this month about a week. My periods usually last like about 5 days. Lately my breasts have been sensitive, like the last 3 times my bf and I have been intimate I bled a little accompanied by the mucous that normally comes when your ovulating.  Well today, I had all the period symptoms, but my period only lasted maybe 3-5 hours. And now nothing. Need to see a dr I know but it's kind of driving me nuts.