Thanks for the query.
pill pack contains 21 hormonal
pills and 7 non hormonal pills.
The hormonal pills all contain same amount of hormones.
So if you took one pill instead of another no need to worry.
If you took, non hormonal pills, now take one hormonal pills within 24 hours to continue the contraceptive
Your chest pain
may not be related to pill and that can be psychological.
So don't worry.
If the pain persists once consult physician.