I normally have irregular periods, but for the past few months its been relatively normal. My LMP was the week of June 15th. My cycle is anywhere between 30 and 40 days when it is normal. I expected my period to come around the time i went on vacation with my boyfriend. He arrived on the 24th of July. I have yet to recieve my period. I have had light cramping, nausea, heartburn, sensitive breasts (not actually sore sore), tired. I have taken a pregnancy test but it has came out negative. Could i be pregnant, and when could i possibly take a new test to show a positive result if i am?