Walking during pregnancy ay okay na gawin from the start, pero ang maraming doctors recommend ay around 3-4 months onwards pag mas stable na ang first trimester at lumalaki na ang energy mo. A few of my mum friends started walking even earlier pero mas low-key lang, parang gentle strolls sa bahay or sa garden, nothing too vigorous. The key talaga ay listen to your body, if you feel okay at walang spotting or complications, light walking is actually really good para sa circulation at mood. Best to check with your OB though para sa personalized advice based sa condition mo, pero generally walking ay one of the safest exercises when you're pregnant.