Pregnancy after a miscarriage

L 🤰🏻 • •Heart belongs to a state trooper 💙 •AGL 4-10-18 👶🏽💜🌈 •Bonus son- ELW 👦🏼💚 •EJW 6-2-20💓👶🏻

I had a MMC back in May at 12 weeks and 4 days. I'm currently pregnant again around 5 weeks and 3 days.. due April 17th according to my LMP. My beta has been checked 2 times at 15dpo it was 86, at 20dpo it was 1010 and it's doubling every 33 hours and my doctor said all my blood work looks good for now. Expect for iron deficiency anemia and vitamin B12 deficiency which I've knew about since March. I'm going for my first ultrasound at 7 weeks on the 31st and I'm so scared of another miscarriage.. I'm so scared I'm going to be told my baby has no heartbeat 😭 I have a good feeling about this pregnancy most days but others I worry so much