Spotting at 7 weeks

jr

Is it normal to spot at 7 weeks? I've spotted on and off it started a light pink color and went away then came back yesterday with a slightly darker color.

Is this normal? I even went to the dr last night and he said the baby is looking healthy with a heartbeat of 133 bpm. But what's the chances of something happening to the baby? Here's what the doctor said about the sonogram below.