My cup runneth over

My starter is active!! I'm attempting to make sourdough bread from scratch so the first thing I had to do was make a 'mother', or starter, in which wild yeast grows. I thought it was a failure because I've been waiting a couple of days now for the bubbling action to take place. I know it looks like a really gross blob but I'm so excited that it's bubbled and even poofed over, which indicates that so far it's a success (and that the bread will rise). Now I've got to 'proof' it overnight before I can begin baking. Hopefully it works!