I Took A Home Pregnancy Test About Two Weeks Ago,

I took a home pregnancy test about two weeks ago, it came out to be positive. the first day of my last period was January 2 2016. I'm assuming I'm about 6 weeks pregnat, I start bleeding two days ago, some like a period no pain really, just a little bit of cramps, nothing major, is that normal. I have two other kids and never experienced this, should I be worried? what should i do?