Bilateral oophorectomy usually with hysterectomy is almost always too invasive though is the only effective cure for premenstrual syndrome . When removal of the ovaries is considered appropriate, it can be followed by oestrogen replacement without of course the need for cyclical progestagens. There is no logic why endome-trial ablation should be effective; the studies which claim that ablation is beneficial in PMS were designed for the treatment of menorrhagia and so are not valid for PMS.
Any technique where the uterus is retained and oestrogen replacement is used will require progestagen to protect any remaining endometrium which may cause the PMS to return in many women.
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The first trimester is very important for the mother and the baby. For most women it is common to find out about their pregnancy after they have missed their menstrual cycle. Since, not all women note their menstrual cycle and dates of intercourse, it may cause slight confusion about the exact date of conception. That is why most women find out that they are pregnant only after one month of pregnancy.