Hi L.,
I'm really sorry about your miscarriage. It's hard to accept this, I understand, but truly, your body is doing what it needs to do, most of the time, by spontaneously aborting a fetus. (That's what a miscarriage is, by the way - a spontaneous abortion.) What it usually means is that something was very wrong with the fetus or it had already died. The body expels it so that YOU don't get an infection and die. Sometimes it doesn't come out like it's supposed to and the doctor has to do it for you (a D&C) so that you don't get an infection and so that you can conceive later.
RIght now it's important to give your body a break and let it heal after the miscarriage. You should be using birth control. You should talk to the doctor and ask for tests to see if you are healthy. Ask the doctor how long to wait before trying to get pregnant again. You should take pregnancy vitamins NOW to help your fetus be as healthy as possible before you even know you are pregnant. Pregnancy vitamins have folic acid in them. Folic acid helps prevent neural tube defects like spina bifida. That's really important.
I don't think you are pregnant, but you may need to take a pregnancy test in a few weeks to confirm until you get your period. Meanwhile, no unprotected sex until the doctor clears it.
Good luck,
Dawn