I am on mt 3rd pack. Last month my period was a bit longer than usual. It was 8-10 days long. And i noticed that my period was late by 8-9 days this month. It was light/medium side and did last 5 days long. I did have unprotected sex. Should i be concerned of pregnancy? Can being on the pill change your cycle? When should i ever be concerned about possibilities of somehow getting pregnant while on the pill?