!! Period stopped early!!!

Okay I’m not sure if it’s normal for one’s period to stop early. So I normally have about a menstrual cycle that last for 6 days, I have never had issues with it stopping on the day 3. I don’t hang out with any other girls really and do not live with any girls, all the girl friends I have well we are all synced for our cycles. None of my friends stopped short or have change cycles. And normally if I have been around someone with a different cycle time I normally just start my early or late when I’m syncing up with them. Also, I did not a heavy flow like normal for the first couple days. Does anyone have any ideas of what may be going on or tips??!