I had a home birth VBAC do I didn't "leave" and I had a really weird labor. My first contraction hit and the next one was 5 minutes later. After that they were 2 minutes apart for 30 seconds the rest of the day. I called my midwife to let her know after maybe 6 contractions at 2 min apart but she said to call back later when things got more intense. Maybe 2 hours later my water broke so I called back to update and they came at that point.
All of this to say every labor is different so you will have to go by when you feel it is time (not being able to talk through them is good) do you have a doula? She would be able to help you at home and help determine a good time to leave while working through your contractions.
Mommy to Fiona 12/09 and new baby Layla 3/12 a HBAC!