The management fee will go toward the safety net so if your level is $1000 and you've already up to $500 of it then you won't get anything back for the first $500.
AnnaBelle - yeah Raven is correct - my OB's fee was also $1800. When I went to claim my management fee back (didnt pay it until I was 30 weeks) DH and I were at $598. I was told the threshold was $1058 - we received $1129.25 back

My out of pocket expenses are only $10 now which is sooo good! OB appointment costs me $80 and I get $70 back

HTH