When would you test?

Mary
I think I'm back to a regular cycle since ending depo provera last fall. My cycles have been 27-29 days. (Before depo I always had 28 day cycles.) June was the 1st time I used an OPK. Got a peak positive on 6/27 which moved my predicted AF up 4 days to 7/5. That's only a 23 day cycle. Still no AF and I'm waiting to test. When I told <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a> AF is late it kicked back my predicted AF date 3 days to 7/8. 
When would you test?