my last active bc pill is today, but during the last week i've had very light spotting for the past five days, and my breasts are super sore and heavy. the spotting is no longer there today, but seeing as it is finals week and i couldn't seem to concentrate on anything else, i decided to take a test yesterday just to ease my nerves a little bit. it came out negative, and i have not missed any pills and always take them within ten minutes of nine each day, my boyfriend also does not ejaculate inside me. is there a possibility that spotting was implantation bleeding and the pill failed? the pregnancy test i took was an early response, but would it be too early to tell??