It's hard to draw a line between happiness and hypomania. The main difference for me is the energy difference. When I am baseline and just normally happy, I still get tired and have normal sleep patterns. I am asleep by ten pm and sleep through the night mostly. When I am hypo, I feel like I never need to sleep. I go to sleep at midnight or one and wake up at five ready to go. I am super energetic throughout the day and can't sit still. I tap my feet or fingers constantly. If I'm baseline I can easily sit still.

What you described does sound like typical hypo, but also sounds like happiness. Think about if your energy level was different from your normal baseline. That should his you some insight.