Just heard heart beat on doppler at 9 weeks, does the risk of miscarriage decrease?

I know there is always a chance of miscarriage with all pregnancies, but i'm just wondering if the percentage decreases after hearing heartbeat! I saw heartbeat on ultrasound at 7 weeks and now tonight i heard straight away in doppler at 9 weeks, and both times the heartbeats were ok, sounding good and normal they said.