You can go right now to the nearest planned parenthood and get emergency contraception. Since they base things off of a sliding scale, it will be anywhere from $70-$100. Taken within 72 hours of unprotected (or broken condom) sex it can drastically reduce your risk of getting pregnant. It is best if taken as soon as possible after the sex. My husband and I had a condom break before we were married and I took ec. We did not become pregnant and I didn't have any real side effects from the pills. It is two pills. You take the first one right away and then I think it was you take the second pill either 12 or 24 hours after the first. If an embryo has already implanted (ie, if you're already pregnant), it will not dislodge it or dispell it. Simply put, if you are already pregnant it will not cause an abortion.
Since you are about a week from your period, you should be safer than if this had happened in the middle of your cycle. Still, there is a chance of pregnancy. Abortions range in price depending on your geographic location and also on how far along you are in the pregnancy. There's also a choice in the type of abortion you can obtain. You can either obtain a medical abortion by taking mifepristone (aka ru 486) or a surgical abortion. A medical abortion (around here) seems to be a cheaper option though some women prefer to know for a fact that the abortion worked. If this sounds like you, a surgical abortion could work out. They range in price and probably average about $450 (at the time when most abortions are performed). If you are pregnant, know you can't keep the pregnancy, and choose to obtain an abortion, you should ask the clinicians if they know of any organizations which help underpriviledged women pay for abortions. Also, if you are pregnant and choose an abortion, you should look up your state's restrictions on abortion. Some states require young women under 18 to gain their parents consent, others require the woman to notify their parents, and others have no restrictions. If you go to the local planned parenthood, they will have that information available to you.
I want to encourage you to continue using condoms even when you do get on the birth control pill. It takes a complete month (cycle) for the pills to really become effective so don't stop using a condom when you get the pills. Also, if you're not in a steady, monogamous relationship then condoms will continue to protect you from std's. Good job on going to the doctor. Regular exams can save your life.
If you need anything else, pm me or post it here.
Peace,
jenn
p.S. I'll cross my fingers for you!