Prometrium (progesterone, USP) Capsules contain micronized progesterone for oral administration. Progesterone has a molecular weight of 314.47 and a molecular formula of C 21 H 30 O 2. Do you at invia still start the crinone automatically the day after 2nd day of intercourse in a clomid and HCG shot cycle because I know some places that test progesterone level nbsp; Prometrium – Uses, Side Effects, Interactions –. My OBGYN told me I could pick a day like the first of the month or even the 15th of the month and start taking Prometrium. Which ever was easy to remember. What I don't know are the best times to have sex to try and get pregnant. I don't even know if I ovulate! I am wanting to get pregnant to! i'm taking it to induce a period so i can start iui and clomid. i was on the prometrium for 12days i'm giving it 3-7days to get my period then i'll call the doctor if i don't get my period. i wonder what will happen if i don't get my period for very long time. So far its been 90days+ i think. Hi all, I have PCOS and I want it to regulate my period, so I start taking prometrium 3 days ago. Today I just start spotting and had symptoms as PMS, cramps, meaning that I'm sure I'll get the complete AF by tomorrow. Do not start, stop, or change the. How long have you been taking Prometrium? Less than a year. 1-5 years. 5-10 years. 10+ years. Are you planning to see a doctor about switching your medication. Cyclic progesterone therapy (not MPA). When Do I Take It? The first day of menstruation is called “day 1.” If you get a period regularly and your cycles are usually 27-30+ days long, start progesterone on the 14th day after flow began and take it for 14 days or until cycle day 27. If your cycles are regular but shorter (for example, if your period starts every 21–26 days), then start. PROMETRIUM® per day for the last 14 days of estrogen treatment each cycle or 3 capsules per day (300 mg) for the last 12-14 days of estrogen treatment each cycle. Warning Do not use estrogens with a progestogen like Prometrium (progesterone capsules) to prevent heart disease or dementia. Using estrogens with a progestogen may raise the chances of having a heart attack, a stroke, breast cancer, a blood clot, or dementia. For my irregular periods my doctor told me to start taking the prometrium 2 capsules 200mg for 10 days every month. I have being doing this now for 7 months and have had very regular periods.