I don't think metformin is working

Chelsea
We have been TTC for 2 years and I recently got diagnosed with pcos and got given metformin to take 3 times daily but I don't think it's working :( I'm using the clearblue advanced fertility monitor which always reads high because it detects a rise in estrogen but never LH So I don't think the metformin is working because the monitor is basically saying I'm not ovulating :( any thoughts???