Losing brown blood this morning ...scared!

Kayleigh • Newlywed!! Expecting our first!! Baby under construction expected completion 29th August 2016 :) :) 💙💗
Hi girls, this morning I'm starting to experience some brown mucus blood, which is very light. I'm so scared this is my first pregnancy and I'm only about 5 weeks. I have no cramps or anything like that, has anyone else had this sort of thing??? What should I do?