Meaning of -'D in English
-'d BrE AmE d —This contracted form of had and would is used only after words (usually pronouns) ending in a vowel sound: he'd hiːd , I'd aɪd , she'd ʃiːd , they'd ðeɪd , we'd wiːd , you'd juːd , who'd huːd , Joe'd dʒəʊd AmE dʒoʊd . After a word ending in a consonant the spelling 'd implies merely a weak form, əd : it'd ɪt əd AmE ɪt̬ əd . The occasional contracted form of did (especially AmE) is pronounced in the same way.
Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012