Yes, light to moderate exercises like walking or prenatal yoga are generally safe. However, always consult your healthcare provider, especially if you have a high-risk pregnancy.
Most women don’t even know that they are pregnant until 6 or 7 weeks into their pregnancy. Some women only know that they are pregnant when they feel too tired or lethargic to exercise. The body will protect against harm, so listen to it. Bottom line, you can continue to exercise unless you have unexplained vaginal bleeding or you are classified as a high-risk pregnancy. Good luck, because most women actually have to stop exercising for a few weeks early on.