4 weeks 3 days, first pregnancy and all I can't help but worry :(

First of all I just wanted to say how helpful everyone is on this app, it is my little comfort zone. First time mom and I can't help but feel that something is going to go wrong 😢 I have endometriosis and have previously been told I would be prone to miscarriages and ectopic pregnancies. I have booked myself in for a private scan where I will be 6 weeks exactly from my last period. I'm just so worried I go and there is just a sack and no baby or I have a chemical or an ectopic. Is this normal to feel this way? I'm googling everything which is making it worse! Any advice or reassurance ❤️