My period is now 7 days late. I have taken four tests (2 dollar tree, 2 clear blue) and they are all negative. my period is very regular and it has now been over a month since my last period ended. Could I still be pregnant even if I am getting a negative? Has this happened to anyone else and ended up being prego? My nipples are also very sensitive and I feel little cramps a couple times a day for the last couple days