Issue is maintaining high enough levels of progesterone after fertilization. Have any of you ever been prescribed HCG injections during the luteal phase in order to maintain progesterone production after possible fertilization? My period usually lasts for 23 days and it's about 20 days and I have extreme cramps that resemble cramps I get from or right before my period. No sign of blood. I tried engaged in intercourse daily during ovulation and now I am on HCG shots so no possible pregnancy is lost due to low progesterone. What do you think is happening? Waiting for doctor to come back from vacation.