I'd say yes and no. Its not possible for the 'baby bump' itself to show at that stage but my body started to change shape almost as soon as I got my BFP this last pregnancy and I dont think it was just bloat, lol. The hormones relax your muscles and ligaments and make you put on weight differently so I think your body can start to look pregnant quite early. It was my 3rd pregnancy so my body seemed to know what to do much quicker than with my 1st.