Lifting while pregnant

Stephanie • My names Stephanie, I`m 25, a wife and mom to two kids, and expecting #3!
Looking for some insight/reassurance. I know you're not supposed to lift heavy things while pregnant but I was alone today and had to get the dog food. I only lifted the 30lb bag once and carried it for about ten seconds to the counter. That should be okay, right? Just asking because my stomach does feel a little pulled just when I stand up mostly. It's not a horrible pain but I am one to panic.