You have not lost your stimulus money. The Recovery Rebate Credit will cover both the first and second stimulus payments. This will determine the full amount of potential refund you are entitled to based on income and eligible dependents, and will be part of the final combined refund on your return, if applicable.
In TurboTax Online, to claim the Recovery Rebate credit please do the following:
Get My Payment - Select the button Get My Payment to see if your information is current based on the payments you did receive.