Spotting during pregnancy

Hi All - I'm 5 weeks pregnant and woke up this morning to some spotting. Light brown in color, thin and seems like a small amount. However, I am having some cramping and am feeling nervous/anxious about it. This is our first pregnancy and I just really don't want to lose it? Has anyone experienced this this early? If so, how much is a lot/a little? Did you have symptoms associated with it? And how long did it last for you? My first obgyn apt isn't until week 9 - however I may call on Monday...