Hi thanks for asking question.
I can understand your concern
Heart
palpitation always not pathological.
It could be because of some physiological cause like fever, excess exercise etc.
But to rule out cardiac problem I would suggest you to do ECG first.
Second this pain could be by
viral respiratory infection as constitutional pain.It is treated symptomatically.
If you have fever and cough both better to do simple chest x ray to rule out
bronchitis or
pneumonitis Like condition although it seems unlikely here.
Finally because of excess exercise muscular strain can occur lead to
chest pain.simple analgesic can be taken with hot compress.
Also rule out gastric problem that can lead reffered chest pain.
I hope my suggestion will be helpful to you.
If still problem ready to help you further
Regards.dr.parth