Don't chance it.
I didn't recognise the first attack.
The second was 3 months later and very mild, slight pain in chest and pain that moved slowly down my arm, no sweatong or palpitations etc.. By the time I got to A+E, I had no real symptoms, ECG, pulse etc all normal. Only blood test confirmed attack and that was 12 hours.
If in doubt call paramedics straight away.