My iPhone stopped tracking steps.

Hello!

This year in august my iPhone stopped tracking my steps for some reason, it basically got stuck on one day and hasn't been recollecting data ever since.

I hoped it was just some glitch in the system or something, but it still doesn't work and I really miss this function. Is there any way I can help it? I had the iPhone for like 2 months when it happened.

Thank you!

Michaela