Are the pills effective?

Im a single mom and found out im 3/4 weeks pregnant today. Im scheduling to go in a get the pills with planned parenthood… I’ve been reading nonstop all day about both medication and surgical options and the medication one seems more of the route I want to go… can anyone share their experiences with taking the pills and if they worked the first time around and are safe? 6 years ago before I got pregnant with my son I had a natural miscarriage, is it the similar process of that?

Im an anxious person and this is all unexpected and stressing me out…. Thank you