‘如果我没记错的话’ 这句英语怎么说？

看你用在什么时候
1:if I'm not mistaken
2:if I remember correctly
3:if I remember rightl
4:If my memory is not at fault
5:If my memory serves me righ
……

if i am not mistaken
if i remember right/correctly
if my memory serves me well
if my memory is well in serve
if my memory is well in order
if i got it right

If I have a good memory...
As far as I can remember...

Had I not memorized it wrong

if my memory serves me