A 21-year-old student comes for a repeat prescription of her combined oral contraceptive pill (the pill). She has been having bad one-sided headaches with flashing lights lasting a few minutes prior to the headache since starting the pill. She has a past history of migraine when stressed, and has some exams coming up. Her blood pressure is 100/70 mmHg and her clinical examination is normal. Which is the single most appropriate management?