When to call your doctor??

Okay so I had a miscarriage about a year and a half ago at 6 weeks. I tested last night and I called the doctors office today and they scheduled for me to come in tomorrow for an ultrasound and Obgyn appt. Am I jumping the gun too soon. Should I have waited? I haven't been tracking my ovulation because my doctor has put me on BC for Jan and feb but I stopped taking it in March. My last period was March 20-26