On Acutane. Did I skip the purge period?

I am on 40mg and have been on accutane for 3 weeks. I never had acne on my back and I got maybe 6 pimples. But my face never purged ?? I got maybe 6 new pimples but that was normal for me ? Will it get worse my second month when I up my dosage or was I lucky and skipped it?

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