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.
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...