Your medication absolutely can play a huge role in the differences of mood, but it can also be masking something that is already there as well. It's kind of a tricky line to walk to determine what could be medication-induced, and what could potentially be a hypomanic episode. I don't know the criteria for a hypomanic episode (like the duration), but I do know in general it is prolonged. I think tracking your moods would be a really good idea to see if there are any patterns, and keep note of what occurred during the day, incase there was a trigger. Also keep note of how much sleep you get every night.

If you can, avoid things like caffeine, which can heighten hypomania too.

Also, if hypomania escalates into a manic episode, do not be afraid to call your pdoc earlier than when you appointment is.

Take care! I hope you can get this figured out, and can be treated properly for whatever is going on.