Late period, and super frustrated about it.

I can't work up the courage to take a test. Hubby and I have been ttc for almost 4 years. I'll be 26 saturday...and on day 38 of my cycle. I normally have like 30-34 day cycles and according to glow, (which is normally right on)I'm a week late. I know I should test, however I am 99% sure I'm not pregnant. We did 4 failed iui's over the summer, and then quit trying all together because we moved to a different state in July and my life has been chaos since. I can't tell you how many times I've been a few days late, then tested and got my period within 24 hours. I don't want to waste another test just to get my period. Lol its just so frustrating. I'm seriously contemplating waiting until Friday to test this way I don't have to deal with cramps for thanksgiving, if my body is going to keep holding out, it might as well be convenient. Lol