I've had that happen more times than I can count. It's hard, because all the terran has to do is hit stim on his MMM ball and A-move. As zerg you have to pull off some Robert E. Lee shit to have a chance.
My biggest problem is pushing into an army backed up by a planetary fortress. I think I need to wait for the Terran to push out more and then destroy his army in the field or drop into his main. Pushing the front of a Terran base is suicide.
if you see that go hard into broodlords. A PF in a home base is a giant waste of money if not used, especially considering the additional building armor upgrade and range upgrade he spent on it and the lost time-income of no mules. You will easily out macro him.
Normally it's at his natural, like the open forward expansion on Delta Quadrant. I lost a game just today where I had a huge macro advantage over the Terran because of that PF. I even had Broodlords but I wasn't good enough to micro them against the SCVs repairing the fortress. I ended up destroying it with banelings, but by that point it had eaten up many thousands of minerals worth of my army.
