You'll start to feel hiccups when you're bigger. I'm 31 weeks and he has hiccup spells atleast 3 times a day. It's like really fast bumping...or really gentle but very fast kicking. Hard to explain but that will start latter on.
Being 17 weeks, that is just the baby moving around right now. He/she has no control over their movement, so, at times it might feel off the wall or extremely fast. In time, the baby will have more control over it's movement and things wont be so fast and all over the place like a convulsion. LOL.
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In time, you'll be feeling EVERYTHING!