Ay, congrats sa baby, mama! Honestly, this really depends on kung paano ka nag-exercise before pregnancy at kung normal ang pregnancy mo, a few of us nag-start ng light walking around week 12-14 when we felt less nauseous, pero iba-iba talaga. Best talaga na i-check with your OB first kasi siya lang ang makikita ng exact situation mo, especially if may any concerns ka man, pero generally walking is safe and sobrang beneficial for pregnancy! Marami sa amin nag-enjoy ng daily walks through the whole pregnancy naman, it really helps sa energy at sa better sleep pa lang. Good luck, mama!