Do I tell my daughter about my recent adult diagnosis? If so, how??

As the title says...I was diagnosed with autism spectrum condition. I am relieved by this diagnosis as I can now make sense of my life and look at ways to improve myself and my problems.

i am certain both my children have autism but I have not gone through getting them looked at yet (I had issues with stigma but I know I shouldn’t have!).

my daughter is 12, is anxious and has issues but copes in school and is happy and doing well on the whole.

my son is 4 and had classic autism symptoms meltdowns refusing to do things he’s asked, never wants hugs or to be touched.

i feel I want to tell my daughter but I’m frightened of scaring her, but I want her to know if she ever wants to explore her own symptoms I’m here for her and understand. I don’t know if I should or how? I don’t think my son would understand. But I am going to parents eve soon and going to ge info before gp appointment for a referral for diagnosis