So I really am a newbie, and the more I read the more I think I get confused!!!

So Glow said I should have started my period on the 6th. However, I sometimes start on the 11th, so when it didn't come on the 6th I didn't think anything of it. As of today, it still hasn't come (the 13th). I have had super sore and tender breasts lately (probably over a week), as well as random cramping. I haven't had anything that would be like implantation bleeding, etc. I've looked back through my cycle that I've been tracking for months. Since January, I've gone 21, 27, 26, 21 and 25 days from the end of my period to start of the next. As of today, I'm at 33 days. I'm certainly late, but I don't want to test too early. My husband is beyond excited, wants me to test, etc., but I just don't know what to do. Any advice would be appreciated!! :) Thanks, ladies!!