Made my 1st yeast starter for todays brew day and I'm not sure if it is working. I used 1 cup of DME to 32 ozs of water for my wort (boiled for about 10 mins). Pitched yeast at 77 deg in a 1/2 growler and covered with sanitized foil. I swirl it every chance I get. I don't see much activity at all. No kreusen and with the bottle being brown I can't see the yeast cake too well. I do have some soam on top when I swirl the bottle that dissipates after several minutes. Is this normal or did I screw up my first starter?