Hi , Since Dec 2015 I Have Experienced A Change

Hi , since Dec 2015 I have experienced a change in my periods , I have symptoms of pregnancy , abdominal movement , even had a few positive urine tests however I have a retroverted uterus and have had neg scans . I have a feral Doppler and can now find a heart beat easily on my left low abdominal , I am very swollen and have severe back ache and often feel movement in my bum .