age gap

I just remove my implant on July this year, and now i just get to know im pregnant for around 4 weeks , what the doc says . I have 3 kids and my youngest is 3 yrs old . I am okay with having the 4th one, but i know my husband’s side is not okay , because of my youngest daughter is just 3 yrs old . How can i let their words dont affect me? and i havent even told them yet but im worried that they judge me ….