Help!! Need advice please

Megan • 24, have a 6 year old girl and an amazing boyfriend! Expecting #2 November of 2015!!
I just found out I'm pregnant, probably about 4-5 weeks, I have a daughter who is 6, had her when I was family probably won't be supportive of my choice to have another baby, except my mother and her side of the dad and his side knew of a miscarrige I had in jan but didn't say much except asked if I was okay. My boyfriend and I are not married but we are in a serious relationship..I have no idea how to tell anyone when I decide to