If you worked in the UK you may qualify for a UK State Pension. A UK State Pension is payable to residents in the US at the same index linked rate as if you were living in the UK. If you have enough insurance under both US and UK schemes to qualify, you can receive state pensions from both countries. However, if you are entitled to a UK State Pension, the amount of US pension you receive may be reduced, in certain circumstances, because of US windfall elimination provisions.
For further information on receiving your UK State Pension, including obtaining a pension forecast, visit the GOV.UK website.