In Pennsylvania, a modification to a child support/spousal support/alimony pendente lite order will generally be retroactive to the date that the petition for modification is filed. However, pursuant to 23 Pa.C.S.A. Section 4352(e), "modification may be applied to an earlier period if the petitioner was precluded from filing a petition for modification by reason of a significant physical or mental disability, misrepresentation of another party or other compelling reasons and if the petitioner, when no longer precluded, promptly filed a petition."