At 10 weeks a heartbeat of 180 is actually pretty normal, babies' hearts beat faster than ours at that stage so don't worry about the coffee. My first scan the sonographer mentioned the same thing surprised me too, but she explained it's just how it is in early pregnancy, so you're good!
As long as your gynae did not flag anything out during your check up, all is good and safe. Don’t worry! Fetus heartbeat tends to be faster. Also, try not to think so much as mental health is important during pregnancy too.