Your HCG levels post miscarriage will drop fairly quickly but that all depends on how far along you were, whether there was a fetus and if you passed the ‘products of conception’ completely or incompletely despite not having a D&C. Progesterone (P4) is absolutely necessary for a healthy implantation of the fetus and a sustained healthy growth of the pregnancy. Without adequate levels of Progesterone, you can get pregnant, and then you may miscarry simply because your P4 levels are too low to sustain a healthy pregnancy. And many women may not even have a period on their own after a miscarriage; if your body triggers a menstrual cycle and you ovulate, you may actually become pregnant which would trigger by a urine pregnancy test as early as the day or 2 before you expect your period; but it would certainly trigger a urine pregnancy test if it was a weak positive, then followed by a stronger positive test 2days later. Despite a rising P4 level (which is excellent!) also get a quantitative serum pregnancy test of quant HCG; this number should double every 48hours if it’s growing appropriately. However, an ectopic can also mimic a normal pregnancy that’s inside the uterus; it will also double HCG numbers but you may have pain by 4-6wks with or without bleeding; then you need to be seen by and OB and rule out an ectopic which could rupture and end up with life-threatening internal hemorrhage, surgery or even loss of your tube on that side. Check out my book Blossoming: Becoming a Woman on Amazon for $19.95; it walks patients through the menstrual cycle and can be a great resource in helping you understand how your body works, saving you phone calls to your doctor’s office or costly appointments/time off of work to answer questions that you may continue to have.
Dr. Vicki Mondloch