Am I being crazy!?

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​I'm concerned about my 20 week scan. They said everything looked fine but I can't see a nose bone ? Only a nose shape and lips? Any advice or our opinion. Ftm so worried about everything