What Causes Missed Period With Stomach Cramps?

hi there i have been taking my basel temp for 1 month now. i was suppose to get my period on june 2 but havent got it yet. my period are irregular and well ive been having cramps since May 31 as if i am on my period but no blood and i have sore breats and lower back pain. Also since the day of my missed period my body temp has been 36.74. its been the same for three days now. Question can i be pregnant because me and my husband have been trying for 7months.