You could bleed from having sex, for doing too much physical activity, from having a subchorionic hematoma, a miscarriage, it could just be normal for you to bleed during pregnancy, or a million other reasons. Bleeding in pregnancy can be the sign of a miscarrige. If the bleeding is brown in color than it is old blood and nothing to really worry about however if its red than it is. Bleeding can also mean that their is something wrong with the baby. Again there is a million reasons of why it causes complications or why it does not. However if you bleed during pregnancy than you become considered high risk. I hope this helps.
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