Here's some advice from the MedHelp website and our I'm Expecting app on bleeding during pregnancy. Bleeding can be normal, but it can sometimes be serious, so it's probably worth a call to your provider.
http://www.medhelp.org/pregnancy-health/articles/Spotting-and-Vaginal-Bleeding-During-Pregnancy-Your-Symptoms-Manual/1980 You can find this in the app by going to the Pregnancy Diary from the home screen and selecting Vaginal bleeding from the Symptoms menu. Then click the menu bar in the upper left and select Symptoms Manual to see your symptoms.