Baby Movement/Flutter?

Around 3pm today, I felt a sort of vibration on the left side of my big belly. I was really excited, but not sure if it was the real thing. I then felt it again about an hour later, and have felt it even more consistently over the past few hours! It's definitely not a push or kick, just a little vibration, or flutter as they say. Seems our girl or guy wants to wish Jose and me a happy 4 year wedding anniversary!