I did lunges a lot, squats, walking, dumbells. It feels good because then you know you're only gaining baby weight and its better for labor :)
I am a gym freak .. Never stopped working out as long as your not trying to to hard or over doing it you And baby are fine .. I am now 36 weeks baby's girl is healthy and so am I. most people say no but if your body is used to working out already before the baby you are fine .. Run it by our doc. Mine was all for it and I'm still going on morning jogs. Just not doing anything to big .
Walking is good but tbh i would personally take it easy you dont want to over do it in first trimester as its a very crutial time for babys development and its where highest risk of misscarriage is do abit of walking everyday nothing like gym or lifting heavy objects though :)