Ay, hindi talaga dapat possible if regular ka ng period, but honestly there's always that small chance lalo na kung irregular ang cycle mo or kung nahuli ka ng pills! A few of us moms din nag-panic about this, the thing is, some women do get light bleeding even when pregnant, kaya never say never talaga. Best talaga mag-take ng pregnancy test kung di ka sure, especially kung may possibility na exposed ka, kasi mas malinaw agad ang answer instead of mag-worry lang. Pag persistent ka sa doubt, go see your OB para lang ma-confirm sure-sure!