Hello again, dear Sidra,
IHK is the chamber of industry and commerce (Industrie- und Handelskammer). Your contract had been sent to the IHK before you started your apprenticeship, because the chambers have to confirm the contracts of all future trainees in the so called "dual system". So it automatically has the stamp of IHK, no worries.Just submit the contract.
Best wishes, and please come back to us if you have further questions.
mbeon-Christine