how long before I request Provera?

Lori
I took my last blue BCP on 2/25 and had a period starting Wednesday 3/1-3/7.  On 2/28 I saw my Dr, started folic acid and PNV.  She told me if I didn't start a period then to let her know and she would give me the provera to "jump start" it.  (I had to do this in 2006 when TRC the first time.  I went months though before I saw a doctor about it. )
So, I should have started today and didn't.  I don't want to jump the gun and call tomorrow, but I don't have 6 months like I did 11 years ago.  
How long should I wait to see if it comes on its own?