Where's the Foam?

[DrCoug]

I just brewed my first batch of gluten free beer 4 days ago and I have no foam on the top (used Safale 04). There is some "burping" but no foam. Did I do something wrong?

 

[Osedax]

Krausen doesn't mean everything. Fermentation temp and recipe please.

Take gravity readings to check if fermentation is chugging along.

Sent from space for your convenience