What could cause a high HCG level at one week pregnant and low HCG levels at three weeks pregnant?

Answer by  Ssally (191)

Two thoughts come to mind. One, the first test could have been a false positive, or lab error. Two, it could be the sign of an imminent miscarriage.

Answer by  Ali41 (1593)

High HCG levels can be indicative of an ectopic or molar pregnancy. Sometimes higher HCG levels can be associated with multiple fetuses implanting. If your levels are lower now, it is possible that you were pregnant with more than one baby, and one did not make it. Also, later in pregnancy, the rise in HCG levels slows down.

Answer by  Rose (6804)

Often the first week HCG levels are high for some women, if they are normal at three weeks then you are fine and have nothing to worry about.

Answer by  Roland27 (16334)

It's very possible that you could have miscarried. Most miscarriages happen before the woman even knows that she is pregnant. The levels could have just been left over from when you were pregnant and then diminished over time.