Spotting on the Pill

Hey all! I took my forth to last white pill (before the 1wk reminder pills=period) 40min later than my usual time. Thinking I'd be ok with a 40min leeway I wasn't stressed about it but the three days since I've been spotting (also taking the last few pills at the exact usual time). What are your thoughts on possibly having less protection against pregnancy because I took it 40 minutes late? I will be starting my period tomorrow.