Yep, that is almost certainly PACs or PVCs. If you're not already familiar with PACs and PVCs, you'll find a TON of posts on this website explaining everything about them. Generally speaking though, they are harmless. Though as hef mentions, it may be worth seeing a doc just to be sure but doesn't sound serious at all.
Alot of my prematures feel like that. Like a gurgling feeling in the chest. If you haven't get it checked. More than likely benign premature beats.