My fertile days were the 14th-20th... I had sex unprotected Friday the 16th and Sunday the 18th (which was my peak fertile day).. I also had sex Sunday the 11th and the condom broke. I took a pregnancy test Thursday and I had an evaporation line. I know this to be true because I took a test (first response) today (mid-day) and it was negative. Could this be because it was too early to detect? My period is not due until next week.