what is wrong is that you are not taking your (birth control) pills properly. missing one by three hours is no big deal but missing two pills in a cycle could trigger the spotting especially if you are on a low-dose oral contraceptive (i don't know what you are taking). spotting can occur even if you take your pills consistently so consult the medical provider who is prescribing them for you for patient-specific advice. sometimes a minor change in dosage would be beneficial if this has happened before.
on the 13th i took my pill 3 hours late and a week later missed two pervious pills and now im spotting pink whats wrong