Just a wild guess that the OP is using buckets, which are notorious for leaking CO2 around the lid therefore no, or very few, bubbles in the airlock.
Regardless... it's a good time to remind that bubbles in the airlock are one way of "seeing" fermentation. But since changes in temp can effect bubbling, it's not a reliable way. If you doubt this, take an empty bucket and set it somewhere cold. Put an airlock on it. Move it to somewhere warm and see what happens. Is the emptiness fermenting? Or is the air expanding?