if my memory serves me right
US /ɪf maɪ ˈmɛməri sɜrvz mi raɪt/
UK /ɪf maɪ ˈmɛməri sɜrvz mi raɪt/

1.
used to say that you think you remember something correctly, but you are not completely certain
:
•
If my memory serves me right, she was born in May.
•
The meeting was on Tuesday, if my memory serves me right.