I'm 18 weeks, and I've been feeling my baby kick for almost a week. Overall I find it kind of trippy. During my last pregnancy my placenta was posterior, so I couldn't feel my baby this young.
If memory serves right I felt my first two before 17 weeks, so go figure. If memory is correct I felt my first baby the soonest, which is opposite of normal. My oldest was the most active baby, by far.