I have had "every other week" periods for 1 1/2 years, like clock work every other Sunday, and am now almost 4 weeks late. Up until last week I have taken 3 home tests, all negative, and a blood test at my dr office last week, also negative. I am having a lot of symptoms like nausea, slight cramps, tender breasts , etc. I don't know if I should try another blood test or should stick with my negative answers.