Helpp

Ive been on the pill since december for pcos. Ever since i started it ive had very regular periods. Im suppose to start my period in 12 days. I started spotting brown 2 days ago and now today its getting brighter but not heavier. Still just a spotting. Ive been cramping and my boobs do hurt (normal for me 2 weeks before my period). But its freaking me out because im spotting and idk why! I havent had any breakthrough bleeding since starting the pill in almost 6 months. Is this normal? I havent missed any pills. They only thing i can think of is i usually take it around 9/10pm and sometimes i take it about 12am. Could that make a difference? Im also on BP meds, and metformin.