I want to be better educated

I'm pregnant with my first child and I am so scared to vaccinate, after my nephew got vaccinated he started having seizures and he couldn't breathe on his own, joining anti vacs groups to better educate myself, if there's anything I need to know or if your experiences could better guide me then please let me know!

Oh also, my SO's family is very for vaccines and I'm scared they will try to call CPS on me if I don't vaccinate, my SO already threatened me saying that he could just bring the child to be vaccinated and I didn't have to be there.