Hi Lisajane (I'm a Lisa Jane too!! lol)

I had bleeding when I was pregnant with Harrison... though I was further along (9-10 weeks)... it was mostly the pinkish to brownish colour.
As Satya mentioned, have your HCG levels increased? Perhaps contact your Dr and arrange to have bloods taken to find out your HCG levels...
Otherwise, I had an internal scan done when I was almost 6 weeks, and we could see a visible fetal pole and a heartbeat... maybe you could find out if that is an option.
HTH... Fingers crossed that is very sticky little bubba you've got!!!