Truth: Don't rush out and buy that cream yet. Some doctors do believe that progesterone supplements might help women with recurrent miscarriages but this is controversial and there's no strong evidence that the supplements help. As for over-the-counter creams, the dosage varies heavily and some of the creams don't even contain any active progesterone. It's best to find a doctor who is willing to prescribe supplements if you want to use progesterone during pregnancy.
Truth: A bicornuate uterus can mean increased risk of preterm labor, but there's no evidence that it increases risk of miscarriage. However, a uterine septum can mean increased risk of miscarriage, and the two malformations look similar on imaging tests. It is common that a septate uterus can be misdiagnosed as a bicornuate uterus.
Truth: Minor trauma such as falling, being hit in the abdomen, or having a fender bender is not likely to cause a first-trimester miscarriage, but it can cause placental abruption in the second or third trimester and potentially lead to late pregnancy loss.
Truth: No one has researched the safety of riding roller coasters or other amusement park rides during pregnancy. There is a theoretical risk that the jerking motions could lead to placental abruption later in pregnancy, and although riding a roller coaster in very early pregnancy is most likely not going to cause problems, no one really knows when the cut off point would be for when it is safe versus risky.
Truth: Certain bacterial and viral infections, such as Fifth Disease or Rubella, can cause miscarriage in some women. But usually the risk of having a miscarriage is far lower than the odds that the baby will be fine.
Truth: The risk of miscarriage is higher for moms over 35 than for moms under 35, but a majority of moms over 35 will have a normal pregnancy.