Trigger post--maybe

I have had two losses before I am now 18 weeks but I can't seem to get excited bc I'm so nervous is something is gonna happen.. I'm scared to buy anything everyone around me has been having late miscarriages when they go in for their 20 week measurement ultrasound.. Everyone keeps telling me it's okay but the back of my head is keeping me from being excited.... Is this Normal.. Don't be to judge mental I'm very thankful I've made it this far with the pregnancy.