When did you start to really feel baby move? I have been feeling flutters (like a tennis ball…

When did you start to really feel baby move? I have been feeling flutters (like a tennis ball rolling back and forth) for about a week, and the last night I was laying on my bed after my shower, and I felt a definite poke (maybe a foot?), rested my had over it and it happened about 6 more times. I know for sure that it was baby, I have never felt anything like that before. I will be 16 weeks on Tuesday.