Jo,

Make sure you are careful about the pregnancy. I don't like the sound of the pain you are having. Low HCG levels is a sign of an ectopic pregnancy. Low HCG levels along with pain doesn't sound right. I wouldn't wait if I were you. I would be going to the doctor and checking the HCG levels again. How far along are you? If you are far enough along they can do a sonogram to see if the pregnancy is in the uterus or possibly the fallopian tubes. I don't think you should continue to ignore the pain. Ectopic pregnancies can be very dangerous.

Take care,
Sam