Low dose Accutane for 3 months and early pregnancy, should I terminate?

I hope to start by saying that I have worn the copper IUD for over a year and that my partner uses the condom every time we have sexual intercourse. So we used two modes of contraception. I have been on alternate day 10 mg Nimegen (a generic form of Accutane) for 3 months since late July. My dosage ended 1 week ago. I just found out I am 25 to 27 days pregnant (11th and 13th Oct were the only two days of sex after my last period). This is 3 weeks of pregnancy. Please advise. Thank you.

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