Can I still see my son if I have not been served the ex parte papers and just have knowledge of it? How do I win in an ex parte hearing?

My husband took my child from me on Friday October 12th. I was told I could see him later that evening. When I started calling and got no answer I got worried and went over to the house where he was allegedly at. There was no answer. I spoke with my mother and she said my husband placed an ex parte against me and I spoke with a cop that said it was true. I have not been served the papers and there is no record of it yet in the court and I just want to know if I have the right to see my 5-week-old son still without being served. Also, how do I beat the false allegations at court?