What Is The Appropriate Dosage Of Misoprostol?

Dear Dr., I am a 29 year old female, with 2 children (3yrs and 4 months, both born by csection. Last csection 4 months ago with risk of rupture due to thinning of previous scar and right-sided renal stone which caused recurrent UTI's in both pregnancies. Now 7 weeks gestation with ultrasound done yesterday showing gestational sack of 4.4 weeks with absent fetal pole. I want to abort; have been advised misoprostol tablets but want to avoid risk of D and C due to recent csection. What is the appropriate dose of misoprostol keeping in mind risk of rupture and D and C. Need to start taking pills asap. Thanks.