Are you looking at your online account with the IRS? Does it show that you received the first two EIP payments for 2020 which would total $1800----$1200 for the first one and $600 for the second one?
Check your IRS account---does the IRS say they sent you a payment that you did not receive? (If you filed a joint return you need to check for both spouses.) If so you can ask for a trace to be put on the payment.
If you were issued a payment and have not received it, see How do I request a payment trace to track my first or second Economic Impact Payments?
If you need to trace a payment that the IRS says has been issued to you, mail or fax a completed IRS Form 3911, Taxpayer Statement Regarding Refund.