Period a week after last period ended?

Tori
My last normal-ish period was dec 25-30th, barely a week and some days down the road on the 11th my period starts up again amd hasnt went away yet. Im not having the usual period symptoms like last time and im also on birth control. My period normally last about 6 days, 7 max. This is a first for me in 10 years, has this happened to anyone?