Oo, pwede na talaga! Sa second pregnancy, mas maaga mong mararamdaman ang movements kasi alam na ng body mo kung ano ang hinahanap, so mas sensitive ka sa sensations na yan, a few of us mums say nararamdaman namin ng 12-13 weeks na sa second baby. Those butterfly feelings you're describing sound exactly like quickening, and honestly it's such a sweet milestone lalo na with your rainbow baby after what happened before! Congratulations, mama, enjoy every moment of this beautiful pregnancy.