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Old Mar 15th, 2012, 22:58 PM   1
kalyrra
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When exactly does the uterus lining start breaking down?


So.. here's something I'm wondering, and haven't really found much information on. I know it won't be the exact same time period for everyone, since we're all different... but in general, I wonder when our body realizes we're not pregnant and starts to break down the uterus lining? I know it's when the hormones crash after the body realizes nothing was fertilized... but how does it know? lol Is it when the egg deteriorates?

I know normally the luteal phase is 12-16 days give or take then we see the shed lining as our period. But what about those who start spotting about a week before?

I've never really spotted beforehand. But now that I'm checking my cervix and CM during my cycle, I've noticed the little tinges of pinkish red I'd not noticed before. Last cycle, I started seeing it at 11 dpo and got AF at 16 DPO.

This cycle, I got a glob of snottyish cm that had pink and red blood spots in it at 7 dpo. I'm now 10 dpo, and starting to see the same pinkish tinge that I did last cycle about 5 days before AF. The 7 dpo spotting excited me, I thought maybe it was implantation. But now, I'm thinking not. So it surprises me that my uterine lining would start shedding that fast, but not actually show up as AF until so much later!

Any thoughts/opinions/knowledge on how this all works? lol



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Old Mar 15th, 2012, 23:02 PM   2
Eva R
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Hi, I am wondering for a long time about this question also...I have searched the web for it but no answer either but I hope someone will answer it.



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Old Mar 15th, 2012, 23:39 PM   3
MrsKA
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From what I gather once the egg starts deteriorate (maybe once it deteriorates a hormone gets absorbed which triggers it?) the estrogen and progesterone levels plummet very quickly and this triggers the shedding of the lining. So add 24 hours onto when you ovulate and around that time is when it would start shedding. I think anyway lol



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Old Mar 16th, 2012, 00:14 AM   4
kalyrra
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Well, I did some more searching online, and found this. It helps a little. lol

About every 28 days or so, some blood and other products of the disintegration of the inner lining of the uterus (the endometrium) are discharged from the uterus, a process called menstruation. During this time a new follicle begins to develop in one of the ovaries. After menstruation ceases, the follicle continues to develop, secreting an increasing amount of estrogen as it does so.

•The rising level of estrogen causes the endometrium to become thicker and more richly supplied with blood vessels and glands.
•A rising level of LH causes the developing egg within the follicle to complete the first meiotic division (meiosis I), forming a secondary oocyte.
•After about two weeks, there is a sudden surge in the production of LH.
•This surge in LH triggers ovulation: the release of the secondary oocyte into the fallopian tube.
•Under the continued influence of LH, the now-empty follicle develops into a corpus luteum (hence the name luteinizing hormone for LH).
•Stimulated by LH, the corpus luteum secretes progesterone which
◦continues the preparation of the endometrium for a possible pregnancy
◦inhibits the contraction of the uterus
◦inhibits the development of a new follicle
•If fertilization does not occur (which is usually the case),
◦the rising level of progesterone inhibits the release of GnRH which, in turn,
inhibits further production of progesterone.
•As the progesterone level drops,
◦the corpus luteum begins to degenerate;
◦the endometrium begins to break down, its cells committing programmed
cell death (apoptosis);
◦the inhibition of uterine contraction is lifted, and
◦the bleeding and cramps of menstruation begin.



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