Ultrasound, Help! Updated...

I went into the doctor today 5weeks 3days, as I've had some spotting (red and brown) very light & a couple small clots (brown). As a precaution and to make sure everything is growing as it should she is sending me in for an emergency ultrasound tomorrow. I am wondering if it will likely be a vaginal or abdominal? This is my first pregnancy and I am a little worried.