Tired of testing and getting negatives.

Hi guys, so me and my fiance is trying to conceive and I calculated my ovulation date. We did things during those days and AF is 21 days late. Everytime I have tested it was a negative. I keep having the same symptoms as before but instead I'm starting to have small cramps, and recently had a head cold. My period has never been this late before. I want to take a test so I can know for sure but then again I don't because my fiance seems a little upset when I tell him it's a negative. I feel bad everytime he gets his hopes up. I also feel like I should know my body better....should I risk it and get another test or just wait it out a few more days? And before anybody asks, I haven't had time to set up any doctor dates because I've been pulling doubles at work every day because we are short on staff.