Quite a Scare

Had a terrible scare today when I went to use the bathroom at Starbucks and found blood. A tiny clot and then quite a bit when I wiped....freaked out. Ran out to tell Baby Daddy and started to panic. Had 2 more similiar episodes within an hour and spotting in between. Called the doctor and go for early ultrasound tomorrow. Why? Why can't this round just go smoothly?