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well maybe, if you're like some yoga master guru who has nothing better to do than flip around in Scorpion all day. BUT if you are a regular human being, like me, or the person practicing next to you, you probably aren't experiencing this blissful "yogic" state all the time. And that is completely okay. When we are opening the heart chakra, we are allowing all of our emotions through-not just the blissed out ones. Here's a great poem about Fish pose that totally gets it. (click me!) (slightly different interpretation of the fish we practiced today!)
When I was surfing the net before class, I found a page that describes different thoughts (vrittis) our mind tends to focus on when we are working with Anahata.. and they're not all "blissy." The ones that really got my attention were -lust -indecision -hope -arrogance and -anxiety. So yep, it's okay, it's normal, it's natural to have these thoughts during your practice. Just keep bringing it back to the breath and work through it!
Jai!