Welcome to FC Shadow!
It sounds like you're describing the 'cotyledons' (see pic) these have a rounded appearance and are perfectly normal
Stick around and we can help make sure you get an awesome harvest and avoid the common new grower pitfalls
Your biggest danger right now is overwatering, a tiny seedling needs very little water so go easy and very soon she will grow true leaves.
Welcome to FC Shadow like Sunshine says overwatering is a big cause the plants don't make it I myself only use a spray bottle and spray 2 or 3 pumps per day also watch your light they can burn up quickly if to close , Sunshine that's a great picture above. The only thing I can say is what sunshine says join us and sunshine WILL get you a great harvest,