Pregnant & anxious

Ok so I'm 5weeks & 4 days & I find myself getting paranoid about my baby. Although my doctor confirmed my pregnancy twice & had checked me & my blood & said my baby is doing fine I'm nervous that when I return for my ultrasound in a month nothing will be there. I've been TTC for a little over a year after me & my hubby had a miscarriage with our first baby. I have symptoms & all but after having my heart broken once I'm just extremely scared & nervous BC I want this baby so bad. Anyway I just needed to say it to somebody. I know after my first ultrasound I will be just fine