Re: DH lost job, I gotta work!!
Sorry about your DH's job!
12 oz is probably about what your LO will need for your first full-time day at work. So you have the first day covered, and that's great! I would pump like crazy over the next 2 days, and hope for the best. Pump after every feeding, pump right after your LO goes to sleep. And make sure you have the right pump for the job- now that you're going to be in the workplace full-time, you need a good double electric pump, if you don't already have one.
If you start running short on milk, and you can see that you're going to have to use formula, try introducing some before you run out of breastmilk. If your baby will take straight formula, great. You can do separate breastmilk and formula bottles, feeding the milk first and using the formula for top-ups. That way if your baby doesn't finish a bottle, it's only formula going down the drain- and FTR, unfinished formula bottles can't go back into the fridge, unlike unfinished breastmilk bottles. If your baby won't take straight formula- and some won't, due to the taste- it may be necessary to introduce it to him by mixing it with breastmilk. Try starting with a small 80% breastmilk, 20% formula bottle and gradually increasing the amount of formula in the bottles until baby will accept a plain formula bottle.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"