light spotting

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I'm 7w2d and just experienced my first little bit of blood. I've had more discharge than usual (sorry tmi) since getting pregnant, but I always check because I'm a first time mom and so paranoid about what's happening right now. Anyway, today was the first time it looked like blood. It was very dark brown and just a little bit on the toilet paper. But of course it really freaked me out. I've decided to go home from work and rest for the rest of the day, since I'm so distracted anyway. I don't really have any cramps today, though I have experienced light and intermittent cramping throughout most of the pregnancy. My ultrasound was scheduled for 5:15 tomorrow, but they were able to move it up to 9 am tomorrow. Will be a long wait for sure. I'm just anxious to know one way or the other how things are going. Fingers crossed that I'm just overreacting right now. Anyone else been through something similar? Thanks and sorry for the long post. 
Update: we went this morning and saw the baby. Everything looks good. Measuring 2 days behind, but got a strong heartbeat. I am so relieved. Hugs to you all. ❤