Need help-metformin

Br
I have been ttc for 2 years. I've tried Clomid and femara and both did not work for me. I had blood tests done for my sugars, but everything came back perfect. My doctor told me to take metformin. MY BLOOD SUGARS WERE PERFECT. Wouldn't it be bad if I took medication to lower my blood sugar if it was fine in the first place? Need help/advice!!