Contracting: HAD

I had – I’d
ɑe hæd – ɑed

You had – You’d
jʉː hæd – jʉːd

He had – He’d
hiː hæd – hiːd

She had – She’d
ʃiː hæd – ʃiːd

We had – we’d
wiː hæd – wiːd

They had – they’d
ðæɪ hæd – ðæɪd

It had – it’d
ɪt hæd – ˈɪtəd

Bill had – Bill’d
bɪl hæd – bɪl(ə)d

Emily had – Emily’d
ˈeməli hæd – ˈeməl(ə)d

This had – This’d
ðɪs hæd – ðɪs(ə)t

These had – these’d
ðiːz hæd – ðiːz(ə)d

Somewhere had – somewhere’d
ˈsɐmweː hæd – ˈsɐmweː(rə)d

A bag had – a bag’d
ə bæg hæd – ə bæg(ə)d

The train had – the train’d
ðə træɪn hæd – ðə træɪn(ə)d

So, you’re going to notice here with HAD it can either be /əd/ or just /d/. A trained – træɪn(ə)d. You can hear either of these.