Apple Watch 3. I have only the apps that came with watch on it, the ones you can’t remove. But I haven’t been able to do the last 2 or 3 updates bc not enough space? I can’t figure how to clear more space. Help please!

Try this;

Unpair your Apple Watch via the Watch app on your iPhone.

Then Re-pair your Apple Watch again,this usually frees up

enough storage space to update your watch.And without any loss of data.

If you don’t have enough space to update your Apple Watch – Apple Support

I want to pair my Fitbit with my Apple Watch. Can this be done with a Series 3 watch?

No.

Thanks

I tried this as well and it still will not give me enough space to update! It says I need 3.1 and only have 2.3 available but I have nothing on it but what came with it! HELP