Period?!?

I have been on BC for over 5 years ish now. My periods have began coming on Tuesdays lately and typically end on Saturday. This time it came on Weds and was gone by Friday morning. Is this normal? Is this a pregnancy symptom? My boyfriend never finishes in me but I know birth control isn’t 100%. I do take it perfectly tho so I don’t know if I’m overthinking but I read things on here where people said their 1.5 day period was really implantation bleeding. Should I be worried ? :) thanks