Pregnancy with bleeding

Katie
I'm a first time mom. I found out I was pregnant 2 weeks ago when I started my implantation bleeding. I took a test and it was positive. Now I am 5 weeks. The bleeding has not stopped. It's not heavier then my period and it is spotting but it appears to be heavy spotting? I don't have any clots. But I still have a strong positive on a pregnancy test. I periodically checked throughout the last two weeks just to make sure that I am still pregnant. How common is it for someone to have bleeding constantly through their pregnancy? I'm just a little concerned because I know that my uterus is not that big at this point. Maybe it just feels like more than spotting because it spreads out on my panty liner. Any insight or advice?