22-24 weeks, but actively at around 26 weeks!
I never felt any movements in my first or second pregnancy until i was right around 24 weeks, although with my 3rd pregnancy i flet movements as soon as i was 16 weeks, at first i thought it was just gas moving around, until a u/s and the baby had kicked, the doc was even surprised because you could see it from outside my tummy.
5w5d with twins!