Hello Manda, I am also 5w4d pregnant and I also freaked out the whole weekend about this thing. First because I've have it for the last 2 weeks and second because I didn't even know I was pregnant and then I just thought I was losing it. This is my first pregnancy.
I went to two doctors, both told me that spotting could be a sign of miscarriage BUT there is no way to know for sure. So basically you need to calm down and wait. I had my first ultrasound yesterday because of the same reason (I was freaking out!) and they saw that I was not 8 weeks (as we counted from last menstruation) but only 5 weeks in size. So, either it hasn't been growing for the last 3 weeks or I ovulated late last cycle. I have another ultrasound next week to figure out, it should be doubled in size.
The bottom line is: spotting is not normal but in half of the cases, everything goes well at the end. Also, only a LOT of bright red blood plus cramps are a sign of real miscarriage. You just need to be sure it's in the right place with an ultrasound, as also ectopic pregnancy can cause spotting and that is really dangerous for both of you.
So, as my boyfriend says, be a temple of peacefulness for the baby, as probably he/she can feel everything you do. Mostly because you can't do anything but wait.