Feeling heavy at 13 weeks

Hi mommies, I’m currently pregnant with my first, going 14 weeks soon. I already started feeling heavy like carrying weight infront and starting to get leg pains after a short walk. I’m an average built woman and sometimes find myself walking like a penguin liao when my legs starts hurting. Is this normal? I also have an obvious bump now, when does a baby bump supposedly become obvious? I’m thinking it’s too early to have an obvious bump and feeling heavy now. My husband is foreign, could it be my baby is bigger than Asian baby size or? Do share when your baby bump start showing and when you start feeling heavy? I hope my baby is not too big for me to handle.