In your first pic, the round item is the yolk sac, which provides the baby nutrients until the placenta is fully developed. That doesn’t happen until The end of the foray trimester. The longer item is your baby. At six weeks, the baby is a “fetal pole” and consist of mostly the spine and a heart. I think it doesn’t even have a head? Or maybe it has a brain at least? Your app should be able to tell you the development stages better.