hard lump

Sayble
Hi mommys so I'm 13 weeks and 4 days and the last probably 3 or 4 days I've been feeling a pain then when I put my hand there there's a hard lump (won't rub out) when I touch it, it moves but I never feel any kicking or anything and I can follow it but it just feels like a hard lump ... anyone else ? Do we know what it is ?? Can't be the baby at the top of my stomach already right ?? 🤔