Bleeding during first trimester, causes?

Patient: I am over week over due on my period 2 days ago I took 2 pregnancy test which came back psitive. This morning woke up with bleeding like I got my period. No cramping just alot of pressure down below. I am worried. Was I those 2 test wrong or am I pregnant and something else is wrong?

Doctor: Bleeding during the first trimester in pregnancy i relatively common. The most probable cause of bleeding in your case c ould be due to an implantation bleed. It is advisable to see your obgyn doctor to rule out other causes of bleeding including a miscarriage.