Do I take the medicine now or wait?

So i finally got my perscription for accutane today which is the eighteenth of november. however the soonest my doctor could see me for my next appointment is december 28th. So im stuck. Do i take the medicine today or do i wait until the twenty eighth of november to start so it can be exactly one month until I get the new perscription. Im going to call on monday see if i can just send the bloodwork around the 15th of december and hopefully get the new month before I see the doctor.

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