Early Pregnancy Worry

Today I go for my first of many regular prenatal appointments. Even though I do feel "different", I worry that something has or will go wrong. Must be because of the other miscarriages and ectopic, on top of all the medical problems I've had over the last couple years. I saw the heart beating at my ultrasound when I was 6 1/2 weeks, but I know things can still go downhill even after that. Hopefully the heartbeat will be strong enough now at 10 1/2 weeks to be heard on doppler and my mind can be at ease. Whatever happens, happens. I just want to know!