About six months ago my ex and I attended a support conference where we signed a support agreement. About a month later I received an email from my ex stating that he started a part time job and how much he earned each month. We went back to court and signed another agreement a couple of months ago. I now believe my ex had this part time job when we were at the first support conference and possibly even a year earlier, but he did not disclose this fact to me so he would pay less support. If I can prove he had this income but did not disclose it at the earlier hearing can I possibly get this additional child support? Or is it too late because I already signed another agreement?