The contraction of we had is we'd.
The apostrophe is the little superscript punctuation mark between the e and the d.
Additional answer
It's not correct to ask 'what is the apostrophe of we had'. It should be 'what is the contraction of we had'. The apostrophe is a punctuation mark that (amongst other things) denotes that a letter has been removed.
No. A spider is a spider and an apostrophe is an apostrophe.
No, your doesn't have an apostrophe. You're, however, does have an apostrophe because it's a contraction for you and are.
you dont use an apostrophe in will not
An apostrophe is not required.
there is no apostrophe
No. A spider is a spider and an apostrophe is an apostrophe.
you've is the apostrophe of you have
The apostrophe for "they had" is "they'd".
No, your doesn't have an apostrophe. You're, however, does have an apostrophe because it's a contraction for you and are.
This is an apostrophe.( ' )
No, taste doesn't have an apostrophe.
you dont use an apostrophe in will not
An apostrophe is not required.
there is no apostrophe
Can't is cannot with an apostrophe.
Shall not with an apostrophe is shan't.
The apostrophe in "they'd" stands for the missing letters in "they would" or "they had."