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Pregnancy Stages



Pregnancy Menstrual Cycle


<!--<h1>Menstrual Cycle</h1>--> <table width= 95% border="1" cellpadding="10"s> <tr> <td align=center><strong>Menstrual Phases</strong></td> <td align=center><strong>Typical No. of Days</strong> </td> <td align=center><strong>Hormonal Actions</strong> </td> </tr> <tr> <td align=center>Follicular (Proliferative)Phase</td> <td align=center>Cycle Days 1 through 6: Beginning of menstruation to end of blood flow.</td> <td>Estrogen and progesterone start out at their lowest levels.<br>FSH levels rise to stimulate maturity of follicles. Ovaries start producing estrogen and levels rise, while progesterone remains low.</td> </tr> <tr> <td align=center>-</td> <td align=center>Cycle Days 7 " 13: The endometrium (the inner lining of the uterus) thickens to prepare for the egg implantation.</td> <td>-</td> </tr> <tr> <td align=center>Ovulation</td> <td align=center>Cycle Day 14:</td> <td>Surge in LH. Largest follicle bursts and releases egg into fallopian tube.</td> </tr> <tr> <td align=center>Luteal (Secretory) Phase, also known as the Premenstrual Phase</td> <td align=center>Cycle Days 15 " 28:</td> <td>Ruptured follicle develops into corpus luteum, which produces progesterone.Progesterone and estrogen stimulate blanket of blood vessels to prepare for egg implantation.</td> </tr> <tr> <td align=center>-</td> <td align=center>If fertilization occurs:</td> <td>Fertilized egg attaches to blanket of blood vessels that supplies nutrients for the developing placenta. Corpus luteum continues to produce estrogen and progesterone.</td> </tr> <tr> <td align=center>-</td> <td align=center>If fertilization does not occur:</td> <td>Corpus luteum deteriorates. Estrogen and progesterone levels drop. The blood vessel lining sloughs off and menstruation begins.</td> </tr> </table>


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