Rainbow after miscarriage

I lost my son November the 15th 2018, I was around 18 weeks ! I am pregnant again with my rainbow baby and I am 17 weeks and 1 day, i have my anatomy scan July 15th & I am so excited but soo scared. Last time I lost my son 2 days before my anatomy scan. I've been eating, sleeping and feeling okay. I havent had any pain or bleeding. I can feel my baby moving and I am super happy but i am also trying to prepare my self If something goes wrong. I want everything to be okay and it's kinda making me feel a little stressed.