Baby Kicks?

I am 18 weeks, and I've been feeling flutters off and on since about 14 weeks. However, this past almost week, I've been feeling stronger distinguishable little bumps against my inside down there. I am 99% sure that it's my little boy kicking me. They come at random, and in random sequence and are always somewhere down on my lower belly.

Today, during one of the moments, I pressed my hand down a bit on my belly and I SWEAR I could feel the little bump against my hand when he kicked.

Is it too early for that, you think? Is it too early to feel? I can't find anything about it in my book.