Ok, so I took a pregnancy test at home when my period was 9 days late and it was negative. I have never missed a period before or been late, EVER! I am now 12 days late but want to wait until Sunday to take another one to be sure. I have had very light cramping for the past 2 and a half weeks along with a sore lower back. I have read so many things and people saying such different things. Has anyone over had a pregancy test come up negative and later take one and have it be positive? Or have you ever talked to anyone who has? I am starting to get really confused as to why my period is now almost 3 weeks late and negative pregnancy test. Advice please!