If you are experiencing severe pain, it is important to call your doctor first thing in the morning. If it is severe enough to disrupt your sleep, you may need to go the emergency room tonight.
If you were over 5 weeks pregnant with confirmed pregnancy tests, and now your doctor is saying that there is no longer a fetus that is viable, your body will have a miscarriage. Some women need assistance in making sure all of the extra tissue is removed after a miscarriage, but only your doctor (after medical exam) would be able to tell you this information. If you are experiencing severe pain, you need to call your doctor to make sure you are progressing okay. From my understanding, you should be experiencing cramping, but not severe pain. It is important to ask your doctor what you should expect when you call tomorrow.
I am so sorry you are going through this right now. Please keep us updated tomorrow.