I bled for a whole first month, then it stopped with my first! If your concerned ide talk to your provider.... my first little girl was born full term and healthy...
Yes it's almost like a periods but I don't have stomach pain. I think it's completely normal but it's better to consult a doctor soon.
I had a same problem when I was in 4th week. I spoke to my doctor and had injections for few weeks and some medications now I'm ok and I'm in 10th week of my pregnancy.
But you should consult your doctor.