Did you sign an agreement saying that the code you have written is owned by the LLC? By your statement that you haven't signed anything my thought is no. Which means you still own the code & the IP.
Coming at it from a different angle, what claim do the other owners have on your code? You own all code you write unless you do it under a work-for-hire agreement or have assigned ownership under an agreement like this one: https://www.upcounsel.com/intellectual-property-assignment-a...