I'm so afraid of having a miscarriage

It's my first time being pregnant, and it's still pretty early in. Anytime I stop feeling heartburn or nausea, or I feel a tiny bit of cramping I get so worried. My husband says I'm overreacting, but I just want to stop feeling like this. Any advice or help from you ladies? Also my next doctors appt is next week and I plan to bring it up with her, but until then.