Re: Did I just run out of milk?
Yes, please don't freak out! More than likely you've experienced a NORMAL adjustment to supply, which is unrelated to your use of the Depo shot. Your doctor's advice was not exactly wrong... Just very lacking in nuance, IMO. Your doc said "Yes, Depo is safe for breastfeeding," and that is backed up by plenty of studies. But if your doc had said "Yes, many studies suggest that Depo is safe for breastfeeding, but there are anecdotal reports of moms experiencing reduced supply when taking hormonal contraceptives, and this is a non-reversible method so if you happen to have a problem, there's no going back," would you have chosen this method? Or would you have looked for something else?
I really don't think you need to run out and buy formula, even with the 3 day holiday coming up. Just nurse, nurse, nurse, nurse, nurse. And watch diaper output. According to Kellymom.com, after 6 weeks you are looking for 4-5 sopping wet diapers per day (or a greater number of less wet diapers, depending on how often you change your baby), and baby may continue to poop many times a day or may decrease poop frequency to as little as one (usually quite large) poop every 7-10+ days (see http://kellymom.com/bf/got-milk/supp...ughmilk-older/).
The are plenty of contraceptives that work just great while nursing. LLLMeg mentioned LAM, but you can also use all the barrier methods (male condom, female condom, diaphragm, cervical cap, sponge, and contraceptive jellies or films), and of course the "self-control" methods like withdrawal (surprisingly effective when the male partner has good control), abstinence (a real popular one! ), and outercourse. If you want a hormonal method, then my personal first choice would be the progestin-only mini-pill, because it is so easy to discontinue use if you suspect you have a problem with it. My second choice would be Mirena, which is progestin-only and implanted in the uterus; its effects are supposed to be more localized than a systemic contraceptive like the mini-pill. The big drawback is that if you're one of the women who has a problem with Mirena, you're stuck with it until you get an appointment to have it removed. I think it is best to avoid the combination estrogen-progestin methods (the pill, e.g. Ortho-Tricyclen and its generic competitors, the vaginal ring, and the patch), because there is good evidence that combination methods do decrease supply.
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!"