Can an ex boyfriend legally require a paternity test?

So I messed up and got played. I started talking with my ex again about two months ago, about two weeks after we were sleeping together, one night we had been drinking quite a bit, had a total lapse of judgement and we didn't use any protection. So two weeks ago she takes a weekend trip down to her brothers, comes back and changes her facebook status to in a relationship with some guy I've never heard of before, needless to say quite the shocker. Now she's decided she's moving about 7 hours away to be with him in a month... we haven't been talking for the last few weeks after this happened and now Im having a mini panic attack after I found out she's moving. My main worry is if she turns out pregnant she'll move never tell me about it, and say its this new guys... now say a few months from now I find out she's pregnant what are my legal options in requiring a paternity test. I understand what it would mean if I was. I would actually have been more than happy to have a child with her before this crazy situation started, but obviously she's a different person than I thought. Anyone have any info on this or some links to share? Thanks all.