late period

Help po sa makakasagot. Last period ko was oct. 10-14. Tapos oct. 27-29 i had blood spotting. Periods ko are fairly regular betwen 27-29 th ng cycle. Laging ganyan most of the time 28th talaga minsan 27 or 29. Anyway 16 days late mens ko until today i have light period. Ano kaya to? Pregnant or delayed lng talaga? Kasi we are sort of trying to concieve . Thanks in advance