chances of miscarrying at 10 weeks?

saw baby at 9 weeks, they said it had a heartbeat. im just worried and paranoid since it is my first pregnancy and i spot on and off sometimes. what are the chances of miscarrying at 10 weeks? i’ve been reading a lot online, not a good way to get your mind at ease, it makes things worse but couldn’t help it and i can’t stop thinking about it.