I don’t know whether to go to the hospital or not

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This is probably so stupid, but I went for an ultrasound yesterday (6weeks) and they couldn’t find anything on the abdominal or the vaginal ultrasound. They took blood and I’m supposed to go back tomorrow for more blood work and then an appointment with the results Thursday to see if my hCG is doubling but they weren’t optimistic. About 30 minutes ago I started bleeding at work. There aren’t any clots but it’s pretty significant. I’m cramping pretty moderately, but I’ve been cramping like this the last week. They didn’t tell me what to do in this situation. Do I go to the ER? Do I wait until tomorrow when I go for blood work?