IS It Safe To Take Mifegest Kit?

Hi, this is Meera wadhera. I had my last periods on Feb 4, 2010. And I got my urine test and I am positive. I have purchased Mifegest Kit. And I have already taken this kit 10 months ago. My gestation period is 42 days app. Suggest me whether I should take mifegest. Please keep in mind that I had ceaserian 1.2 years ago. Waiting for your reply.