This also happens to me. Especially if I'm anxious. Every couple of days I will be trying to swallow my own spit but won't be able to swallow properly for whatever reason. I just wait a few seconds, swallow again, and everything goes smoothly. As far as I know, I don't have MS :)
There is also a place in my mouth but near my throat where food like chips tend to get stuck. Short of rinsing my mouth, nothing can get it out. This has been happening my whole life so it has to be benign.
Also, people with MS usually present multiple symptoms which are somewhat severe. If that is the only thing that happens, and it's been months, I think you're fine! Even if you did have other symptoms, a lot of them are shared with anxiety/stress and can be harmless body quirks :)