Excited but nervous

My husband and I tried for about 4.5 years so when it finally happened I was naturally excited. Then he tells me about his friends significant others who miscarried and it has me very nervous. He also treates me like bubble boy. I am currently 7 weeks and 1 day, will have my first ultrasound at exactly 8 weeks. I eat heathy and still do moderate exercise. My only problem at the moment is coffee. I still have about 8oz a day. Anything I can do better to decrease the risk of a miscarriage?