Stress or pregnancy

According to Glow, my period was supposed to start on Monday and it's still yet to start with no hint of it. Mind you, it tends to be irregular and I've been incredibly stressed out the last couple of months, but I also had (protected) sex during what Glow says was my fertile window. I'm planning on getting tests sometime this weekend and testing. Even though part of me really wants to get pregnant and have a baby, I know now isn't the right time at all. I could use some support.