how should I tell my mom I'm pregnant

Tonya
I'm 25 almost 26 in a long term committed relationship with my soon to be fiancée and I'm 7 weeks pregnant . 
My mom is a religious but not judgemental person as she had me and my sister out of wedlock but I still feel like she would have wanted me to be married before getting pregnant
This pregnancy is planned very very planned but I'm still nervous about how to tell her
Should I tell her I'm engaged then wait a couple months then tell her I'm pregnant? Or should I tell her both news at the same time?