I'm 30 and me and the bf been trying for a couple yrs to get pregnant...I've been using this lubricant called concieve plus everytime we have sex these past 7 days...and last nite I broke out in extreme chills, had a high fever, sore throat and was having weird pains in my lower stomach...prior to this, ive been craving things at weird times..my period isn't due for another 4 days on April 17th 2015..I missed a period in Feb but got one real heavy in march...how long should I wait to take a test this time being I've been so disappointed everytime I take them and they say negative..or should I just go get blood test done