Ideally purpose of ultrasound before prescribing abortion pills is to locate and confirm the site of pregnancy. If the pregnancy is intrauterine then only abortion pills can be given.With transvaginal ultrasound  at 5 weeks the accuracy increases further in terms of site and cardiac activity of pregnancy. u need to consult ur gynaecologist for further treatment because it may be early pregnancy not responding to medications or ectopic or a biochemical pregnany

sometimes abortion pills doesnot work. If there is no bleeding or pain after taking pills then you have to get vacuum aspiration done  by gynaec.