Worried

Hi, I just got my BFP last Monday. Now I’m constantly worried thinking of miscarriage or ectopic pregnancy because I haven’t had my first ultrasound... my first appointment is Dec. 18th, I’m happy but I just can’t stop worrying. I can’t stop researching negative things. I just want a healthy pregnancy 😩 is anyone like this right now? I’m 4 weeks 4 days.