Last period nov 9 through nov 13 i have tooken 5 preg. test and all came up negative . all of them cost under ?

10 dollars not , that i am cheap . it is like what 1 week till the first should i go out today and buy a expensive one or just wait it out. by now i would of done had my cycle would of already gotten cramps . nut , have not i love sausage and the day before yesterday i ate some and felt yucky and today when i had christmas lunch i ate and felt yucky. could i maybe be pregnant and because , i use the test all but , one in the even time it has not detected it or i am just plain not . and i want to be so bad that i just want give up and i am wasting my money . all answeres are acceptable and appreciated but ,rude and snooty uneeded answers and comments .