How to increase accutane dose from 20mg/day to 40mg/day?

I am a female , of roughly 78 kg's i have moderate acne but most of the time its cystic acne.. i have started taking isotretinoin a week ago 20mg/day i know its very low.. there is not any side effect apart from chapped lips. i want to know, should i increase my dose after 2 weeks into accutane to 40mg/day. because i have to finish my course in 5 months. ( Also i haven't seen any initial breakouts, i don't know its initial breakout or hormonal acne, because my date is near)

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