So excited!! But torn...

I found out a couple of days ago I'm expecting. I'm 3 and a half weeks pregnant and I'm beyond excited!! It's my second baby but it's my fiancee's first!! We're both really happy and excited and nervous...But the only thing I dread is telling the news to my family. Everyone knows their family, cause they live together for years so one would know how they would react. None would be particularly happy if I break the news because I'm not married yet, especially my dad. With my first child, he called me every curse word in the dictionary, Spanish and English too. So that gives me a reason to be wary for this pregnancy as well. I'm not exactly sure if I should tell them early on or not.