Puppy Help !!

Kayla • I'm spiked out and I handled my business. ✌🏾️
Ok so my puppy (Buddie) just turned 5 weeks last Sunday and we've been feeding him Cesar Home Delights (As what the previous owners told us to feed him) anyway he has been crapping everywhere and now I think he has round worms (I think) is there anything I can do ?? We take him to the vet Monday because it's not open on Sat or Sun. What can I do before then ??? Please help! PS: His and English Bulldog any tips anything is welcome.