For some instances it has seen that abortion of fetus (unborn baby in womb) is happened naturally without any external procedure. That may happen for a single time or for several times for some cases. According to WHO This type of mishaps are defined as spontaneous abortion or miscarriage. Miscarriage happens When the age of fetus is below 20 weeks and weight is below 500 grams. Pregnant woman even cannot feel that the fetus is not alive. Only the after effects will indicate that mishap.
Maximum cases of miscarriage happen before 12 weeks of pregnancy . The risk factor of miscarriage is maximum in first trimester or more precisely before 6 weeks. When the the miscarriage happens before 8 weeks, in 30 percent cases there has no embryo in embryo sac or placenta. This is called blighted ovum in medical terms. Many woman get astonished to know that there was no embryo in her womb. The statistics is strange that the conclusion of 15 to 25 % of all pregnancies is miscarriage.
Some times it happens that after short period of implantation miscarriage occurs. That means the sperm fertilised the egg but it cannot survive too long. It is termed as chemical pregnancy . Pregnancy card test will show faint positive in that case because HCG secretion has started. But after that bleeding will start and it turns in to your normal period. Most of the women may not realize that she was pregnant because the bleeding of miscarriage is coincide with her normal period. About 50 to 70 % of all miscarriages occur due to chemical pregnancy . The direct prevention of miscarriage is not possible. You can only find the causes of miscarriage and according to that you can start treatment of possible risk factors. That may help to minimize the chances of miscarriage.
So don’t be panic. Stay calm and stress free to avoid the mishap. Let’s check out the Signs of miscarriage for your further proceedings.
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Author's Bio: 

My self Sudip Mazumdar. I am a mechanical enineer. Recently I am working in a Govt. sector. Beside this I am also working as a support staff of a renowned ginecologist of my area. So working with him I have acquired knowledge on pregnancy.

Two years ago my wife has faced a miscarriage, after that I have enriched my knowledge on pregnancy from different sources like net, books, magazines and from doctors. I want to share my Ideas and knowledge with all.