If you made up for the missed pill by taking two on the next day, you are amply protected. If not, you are at risk and the cause of the spotting you had can be attributed to a breakthrough. This could also be the reason for the early onset of the period. I would suggest in the current scenario, an estimation of the serum beta-hCG
titre as a home pregnancy
test may not be of much value so soon. Also, see a specialist for a proper appraisal of the situation and further management. Take care.