emergency contraception
"In a nutshell,  March 2017, I had a normal period; had intercourse with my husband around the end of March and took a Plan B the next morning. Within about 5 days I had another heavy period that lasted around 5 days. I figured this was due to the Plan B. A week later I took another Plan B around 10 hours after intercourse which caused me to have another 5 day long heavy period. This means in April I had what I thought was two heavy 5-6 day long periods. However, it is now the middle of May and I found out I am pregnant. According to my doctor I am around 7.5 weeks along which means I got pregnant during the first Plan B attempt. I don't understand how I had three full length heavy periods but I am still pregnant??"