12 weeks - threatened miscarriage

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Today I went to the ER after waking up to find that I had been bleeding overnight and still was. Dr said it is a threatened miscarriage. They did an ultrasound and baby looks fine with heart rate of 150. They couldn’t find any reason for the bleed. I will be 12 weeks Sunday. Anyone have experience with this situation? I’m supposed to follow up with my ob next week but just so anxious now!!