For most of my life, my period has been a little irregular, but over the past several months it has been pretty consistent every month. For some reason, my period is around 14 days late and I've taken 4 pregnancy tests, but they've all shown up to be negative. I know that at home pregnancy tests have only a certain amount of accuracy. I'm also NOT on birth control, and I'm only stating this because I know that it can fluctuate your period!