Irrational fear

I am 16.5 weeks pregnant, I haven’t had an ultrasound since 10w5d. I keep having irrational fears that my baby is going to have some sort of birth defect. I don’t know why. And of course, once I watched one TikTok video of some rare condition now it is all that floods my feed.

I feel like a horrible person for being so worried that my baby could have some sort of deformity. Shouldn’t I be excited no matter what? Ugh. Does this mean I’m not cut out for motherhood if I’m worried that I won’t love a baby that isn’t perfect?

Idk I’m confused and feel guilty for even having these thoughts. My NIPT results were fine, I get my blood drawn next week for AFP test, and then another 3 weeks until my anatomy scan. Any thoughts or advice?