hello,

well i sold a book through media mail that i thought cost .55 to send, but i might need to pay a few cents more. i paid for the postage online and printed the shipping label at my house. i believe i miscalculated a few ounces so if i did i need to pay {content}.20 more. i sent it on thursday (today is sunday) and all it says in the tracking info is "electronic shipping info received", not "processed through sort facility" like another item i sent on the same day by flat rate mail.

although i highly doubt it, is there a way i can pay for more shipping even though i accidentally sent it?
if i did need to pay more for shipping, and i cannot do what i asked above, what will happen to the book? will it be sent back to my house?