Congratulations on your pregnancy! I don't have all the answers but here are some things that worked for us:
1. If you need stuff, just ask. Join freecycle and see if anyone is giving away the things you need. Also check craigslist, church yard sales etc. These are GREAT sources for cheap baby stuff - frequently hardly used at all.
2. Save before you even see the money. If you don't have direct deposit on your paychecks, get it. Then have the bank automatically put $100 (or more if you can afford it) into a savings account on your payday. That way you'll never even see the money. I did this all through grad school while living on $13,000/year (but put it into an investment account) and at the end of four years I had over $5000 saved without even trying!
3. Pay off your credit card. YOu can use the same tactic here - budget $500/month (or more if you can possibly afford it) to go to your credit card. Pay it first, before you spend anything else - right after you get your paycheck.
4. Don't carry your credit card. Use only a debit card until you get the cc paid off. That way you can't spend any more than you have. Once you get the cc paid off, only spend what you can PAY OFF COMPLETELY every month. You should never carry a balance.
5. Keep a sheet on the fridge where you write down what you spend every day. We did this for over a year to get a handle on what we spent. Kept it in categories like: Groceries, Eating out, Discretionary (for both me and husband), Household, Personal Care (haircuts etc). It became very apparent where the money was all going after doing this for a couple months. And then we could identify where we needed to go without.
Good luck with your pregnancy!!