Super nervous

Paris • 21. With a little mini me who turns TWO Jan. 27th! Phlebotomist & Server.
I had a miscarriage around the end of January 2016. I am now pregnant. According to this app and the doctor I'm due February 25th 2017 and I'm 5 weeks and 3 days along. My doctor scheduled me an appointment July 5th 2016 930am along with a ultrasound appointment right after. I'm super happy and excited to be having another baby. Even got a boy and girl name picked out. Just super nervous I might miscarry again. Any advice??