Pregnant moms who have had a previous miscarriage, for example, may feel extra nervous about working out during the first trimester, and that’s completely understandable. A risk factor is a trait or behavior that increases a person’s chance of developing a disease or predisposes a person to a certain condition. Rarely, doctors are able to find an issue that increases the risk for a miscarriage. Most importantly (for modelling purposes) the per-week risk of stillbirth actually increases later in pregnancy, around the time of birth. Miscarriage and stillbirth are two different types of loss with different sets of causes and risk factors. The risk of having another miscarriage after the first one increases. Credit: iStockphoto A garden-variety cold, a sinus infection, or even a stomach virus isn't likely to affect your pregnancy . The first trimester, or three months, of pregnancy, can present many risks to the developing fetus. Eating foods such as papaya or drinking pineapple juice can cause internal contractions and cervix dilation leading to a miscarriage [1] [2] . For women with recurrent early miscarriage, the doctor will usually subject her to a complete medical, physical, and genetic examination to pinpoint the problem. About a quarter of all women, though, will experience some light vaginal bleeding (spotting, it’s called) during their first trimester so this is not highly unusual nor is it a sign of increased risk of miscarriage. Risk factors for miscarriage include: Maternal age. In that case, treating the issue may help prevent a future miscarriage. Compared to those who stopped drinking alcohol at the earliest signs of pregnancy, those who continued drinking into the first trimester were at a nearly 40 percent increased risk of miscarriage. This may be the reason most couples announced a pregnancy after miscarriage risk subsided. First trimester. Usually, the chance of miscarriage by week is high in the first trimester of pregnancy and most women face a 9 weeks pregnant miscarriage risk that they need to be alert about. Here are some of the factors that increase risk of miscarriage … Some studies show an increased risk to a pregnancy even if only the father smokes. Well, it depends. Getting sick in the first trimester increases your risk of pregnancy loss. However, about 85% of women who miscarried carry the next pregnancy to full term. Dr. Miscarriage during an early stage of pregnancy (first trimester) is very common. Because organs, facial features, skeletal tissue and limbs are developing at this time, any negative affect on the fetus can result in serious birth defects. Studies show that the risk of miscarriage is 12% to 15% for women in their 20s and rises to about 25% for women at age 40. Bleeding is often the very first sign of a miscarriage. Hence the somewhat gray relationship between miscarriages and exercise. 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