A little scared

Kristain
I'm 10 weeks an I had my first ultra sound at 8 week an I seen the baby an heard the heartbeat,I did my follow up to with my doctor today which was 3 weeks from my last visit ..an today he tells me everything looks great an I'm gaining weight but he wants to see me back in 2 weeks to listen to the baby heartbeat .. I'm nervous because my previous pregnancies I never had to that that..I'm not sure if things have switched up in the past 4 years or if he is worried about something...but wouldn't he tell me? Anyone else went through this or have an answers for me? I really don't want to worry but God I can't help it😔😔