Constant spotting-help!!!

Has anyone else had almost constant spotting through their pregnancy and had a normal pregnancy? I've had anywhere from bleeding to pink spotting to small clots. And after each time I've went to the dr and had an ultrasound and the baby was healthy with a normal heart rate. I don't want to call everytime it happens I'm just concerned. I'm 8 weeks today. I'm also on pelvic rest. Just looking for positive input from someone who has had spotting through out pregnancy