So how long to wait?

Stephanie • TTC 1st.
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...