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What does it mean when you have had bleeding and cramping in early pregnancy? - cramping in early pregnancy more condition_symptoms

I bled 3 days after my period I) (Wednesday, then stopped.It was only a few hours. Only a little in my underwear, but did not in the bathroom, which I think I waste my time. Then nothing, I took two pregnancy tests and both are positive. So I went to the doctor and they have a pelvic exam and said everything looks good, but an ultrasound scheduled for next week. I had some cramping yesterday and today but no bleeding what so ever. The bleeding had cramps last week and now is. They were never in the same period. I had implantation bleeding with my first child, but it was much earlier. I have only five weeks and the nervous system, wait a week to find out. Ideas?