emergency contraception
"The incident happened March 31st, the condom broke and I panicked because I was in the fertile stage of my cycle. I took the morning after pill within 24hours (two doses because the first didn't stay down) and 6 days later I had a period which was about a week earlier than expected. I had a blood test to check for pregnancy hormones and took at least 10 home pregnancy tests. All the tests turned up negative but I was still worried, especially when I didn't get my period when I expected it. 
My period was 4-6 days late but seemed normal (a little longer, lasting almost 5 days instead of my normal 3 days) and came 6 weeks after the last one. The pill worked for me even though I'm overweight. I also had almost every symptom the pill suggested."