Yeah this has happened to me. My gynecologist said if its lighter than a normal period, you can take an extra pill as soon as you notice it happening (in addition to the pill you normally take that day.) Though I've also heard/experienced this because of a low-carb diet. Mine started at first because of a change in a thyroid hormone pill dosage.
A *lot* of things can cause spotting/breakthrough bleeding when you're on the pill; the synthetic hormones don't allow the uterine lining to build and strengthen or some such (which is also why usually people get lighter periods on the placebo week.)
Anyway, like teriaki said, if its bothering you, talk to your doctor.
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