So how long to wait?

Stephanie • TTC 1st. 24 and hubby is 27. Ready to start our family.
Today should be the second day of my period. My period is usually 30 days apart and lasts for 3 days. I was just wondering how late is normal? I know a lot of women TTC who are a couple of days late for whatever reason. So should I wait it out for a couple of days or should I test. I really really don't wanna get my hopes up. I've been trying too long to do this again. I'll go crazy...