Fetal doppler

I know this may be a dumb question but I’m still gone ask. I’ve suffered 10 miscarriages in my life time. Here I am 8 weeks pregnant and filled with joy but I’ve been using my doppler since yesterday trying to find a heartbeat just for fun for about 20 mins and then today I used it about 20mins. My concern is do you think I can miscarriage by using the Doppler to early and for that long?