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You are here: Home > Fertility & Trying to Conceive > Menstrual Cycle Days

Menstrual Cycle Day 21

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What is happening internally?

The corpus luteum continues to release high amounts of progesterone to maintain the uterine lining. If conception occurred - the blastocyst finds a place in the thick uterine lining to implant. It burrows deep into the lining and grows at a rapid rate. Implantation signals the corpus luteum to stay alive and continue producing progesterone. Trace amounts of hCG are being released from the implanted fertilized egg.

Outward symptoms:

Basal body temperatures remain high above the coverline. Cervix is low, firm and closed. Cervical fluid is dry. You may experience bloating or water retention. As a result of implantation of the fertilized egg, you may experience mild cramping and/or a bit of spotting.


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Menstrual Cycle Day 28

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Showing 1 - 9 out of 9 Comments
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nikki Apr 21, 2017 12:22:19 PM ET

Hello am on day 21 i have been having cold sore throat and headaches and cramps is dt a sign of pregnancy?

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tin m Jan 23, 2017 05:17:12 PM ET

I'm on day 21 and trying to conceive. we had contact on day 9 and 10 then again 14 and 15. saw some streaks of blood on day 19. could it be possible i have conceived?

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Guest Nov 17, 2016 03:43:01 PM ET

My cycle in the past has been regular, now the past two months it's been 21 days and normally around 28. i have an 11 yr old son and trying to have my last at 39. i'm not sure what's going on. waiting on my period to come so that i can schedule an hsg and post coloital.

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Laura Mar 13, 2015 12:22:37 PM ET

We did the baby dance on cycle day 20. today is cycle day 21, and i woke up with nausea, and now i am cramping. did we conceive?

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naveen Jan 16, 2015 12:30:07 PM ET

I have a 30 to 39 day cycle. it varies from month to month. well i'm on cycle day 22, and for the past two or three days, i have been having these kinda awkward cramps in my lower abdomen, and weird twinges. i have different ovulation apps, and they all say something different. did i ovulate on cycle day 21?

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jay Jul 25, 2012 07:41:49 AM ET

I have had a normal average 29 day cycle for the past 30 years always lasting 4.5 to 5 days i am now 43 and trying for my third baby for over a year now. this month i had a short period of 3 days and i am now on day 22. started bleeding yesterday on day 21 have no idea wat to think any suggestions should i be worried i have had tests and i am not going into memopause

Bee Feb 14, 2014 03:18:08 PM ET

First, congrats on trying! set aside current trying for pregnancy and deal with the menopause fear. check your mother's, aunt's and grandmother's entry into menopause time. are these their initial symptoms? are you early? and get your worrying out of the way. second, consider seeing your doctor. you could have uterine tumors - that's serious, so let a doctor rule out dangerous things. then, keep trying! even of you are entering the unpredictable menopausal zone - you're probably still ovulating here and there and you've even got a better chance for twins!

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jazz Apr 10, 2012 09:21:42 PM ET

I had 28 days menstrual cycle for years and taking birth control pills continuously for 6 years, but just this month i tried to stop taking the pills and i just had 21 days menstrual cycle, is this normal? what could be the reason behind that?

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nicole Mar 8, 2012 10:39:49 AM ET

I'm hyaving alot of the cramping but not the spotting can i still concive

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Amanda Mar 7, 2012 02:22:11 PM ET

This website has been great. but still in limbo i am day 22 of my cycle and had mild cramps and spotting since dpo 21 my period is due cycle day 23 when would be the best time to test?

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