HI LuckyLil13,
Thanks for coming to Apple Support Communities for help with your alarm on your Apple Watch. It sounds like it's going off on your iPhone and Watch at the same time.
These alarms can work independent of each other if you set the alarm on the Apple Watch only: Add an alarm on Apple Watch.
If the alert is being pushed from your iPhone to your Apple Watch, then it still not be heard on the iPhone.
"See the same alarms on both iPhone and Apple Watch
- Set the alarm on your iPhone.
- Open the Apple Watch app on your iPhone.
- Tap My Watch, tap Clock, then turn on Push Alerts from iPhone.
Your Apple Watch alerts you when an alarm goes off so you can snooze or dismiss the alarm. (You aren’t alerted on your iPhone when your Apple Watch alarms go off.)"
If the issue is still occurring, try unpairing the Watch and iPhone, then set them up again: Unpair and erase your Apple Watch.
Let us know how it goes.
Have a fantastic day!