My period started on the third week of my blue pills (sprintec bc) and i started spotting while taking the white pills for the 4th week. is this normal? i normally start my period on the white pills but ive been starting early?

When did you start using Sprintec and how long has this pattern been going on ? Breakthrough bleeding is not uncommon early in birth control pill use. Also if you had an infection, were on antibiotics or had recent covid vaccine- as that can affect cycle. F/u/ w/ MD https://www.mayoclinic.org/healthy-lifestyle/birth-control/expert-answers/seasonale-side-effects/faq-20058109