Hello, and I hope I can help you today. A beta hCG level of under 50 is considered what we call chemical pregnancy which means that a very small amount of pregnancy hormone may have been produced by an egg and sperm which did come together, but did not necessarily implant. It is true however, that a developing pregnancy should double the beta hCG level every 48 hours. In your case, since the level has dropped, it is unlikely that this pregnancy is normal. Your beta hCG level should be continue to be followed as even though your hormone level is very low, there is still a possibility of an ectopic pregnancy, however your most likely diagnosis is a chemical pregnancy, which is actually a kind of miscarriage. There is nothing anyone can do to prevent a miscarriage. Bed rest, taking hormones, or any other treatment cannot make pregnancy develop that is not destined to do so. I generally try to advise my patients were trying to become pregnant not to test their pregnancy hormone via urine or blood until they actually miss a menstrual cycle. Chemical pregnancy is a relatively common, one in 10 pregnancies will end in miscarriage and they estimate that if you include chemical pregnancies, which never even implant in the first place and produce bleeding at the same time of the patient s expected menstrual cycle the rate may be as high as one in five. So psychologically, it can be very distressing to learn you have a positive pregnancy test before you would actually miss a menstrual cycle. If you had not been tested, you most likely would ve bled on time for your regular cycle, and never known that this chemical pregnancy ever took place. Furthermore, nothing can be done to prevent miscarriage in a pregnancy that is not destined to develop. So bed rest, taking hormones, or any form of treatment cannot correct the development of an embryo that does not implant. So I m sorry to report that in your case, this pregnancy is most likely not viable no matter what you do. Once you pregnancy hormone level returns to zero, you should discuss the plan going forward with your fertility doctor. Certain fertility medications, when taken for longer than four months, can make your uterine lining thin which can interfere with implantation. I am sorry that this answer may not be the news that you want to to receive, however with proper medical care I sincerely hope that you can achieve a successful pregnancy. Best wishes, Dr. Brown