Four Days late negative test.
My cycle is always 28 days even an occasional 29 day. Today I am four days late. I have never been this late before. I took a pregnancy test yesterday morning. The first response test and it came back negative. I have been having cramping, head akes and have been very tired. There has been no sign of mt period. Yes I am active. Please let me know what you think. Also I hav't been stressed, I am not on any medication nothing has changed at all in my life style. So if the test is right and I am not pregnant what else could it be?