Most spotting in pregnancy is benign, but should be evaluated by your ob.
You don't need to run to the er unless its heavy bleeding or if you have a lot of pain. Cervical bleeding after intercourse, miscarriage, ectopic pregnancy, implantation bleeding, or subchorionic hemorrage are all possible sources of bleeding, but usually everything is ok. If your blood type is negative, you may need rhogam.
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