Bleeding in 1st trimester (4-6 weeks apx.) . Advice & help?

I am so concerned, worried, sickened, nervous. I have an ultrasound, appointment with a nurse practitioner, and blood work tomorrow because we cannot make it in today. This is the 3rd day of this going on. First day was light pink spotting when wiping for a few hours, second day was red blood on the liner & increasing amount of it throughout the day, all day. Today is the same as yesterday. I have a queasy stomach. But no cramps, abdominal pain, and not soaking through pads.
Has anyone else experienced or is experiencing this? I just need some support or an answer. I'm too afraid of it being a miscarriage, chemical pregnancy, or threatened miscarriage.