During the 16th of September and the 2nd of October I took four 10mg isotretinoin tablets consecutively (4 days) I cannot be sure of the exact time period. I later conceived on the 4th of September despite taking the emergency contraceptive pill within 4 hours after the incident with a 95% chance of protection. Calculating from my last period I am now 9 weeks pregnant. I am considering a medical termination due to this. Is it necessary how high are the risks with a smaller dosage?