bleeding

Hi all so just posting to try and get more insight. I have been bleeding quiet heavily, this is day three( it started after I went swimming with my toddler and was running around the pool playing) I went to the emergency room yesterday where they did an internal exam, the womb is all in tact and not open so it's not a miscarriage, they couldn't see anything on the scan, not even sack, I'm 4 weeks and 4 days. The doctor said not to worry, I have an appointment with the early pregnancy unit tomorrow to see if the bleeding is caused by an ectopic pregnancy. Has anyone else experienced bleeding like this and had a positive outcome.