I bled at 5.5w, 12w, and 20w and delivered a healthy baby last week. I'm not sure what the cause is in your case but mine started as implantation bleeding then just a result of a vascular cervix being irritated. There can be positive outcomes, good luck!
I had some bleeding early on in my pregnancy and now I'm 22 weeks, it's really not uncommon in the beginning. I know it's hard not to worry but just try to stay positive, Good luck to you and the baby.
Re: Bleeding at week 5!!