12 DPO. Vvvfl. BFP! What do i do??

Im so nervous. Im scared that this will disappear or that my period will start. Im scared to change my Glow over to pregnant. Im scared to tell my husband. We have been trying for what seems like forever and i am so used to the disappointment of BFN. How do i tell my husband??? If everything goes to plan i want to announce to family on christmas. I cant keep this from him much longer though, how did you tell your SO??? Gosh, i am just a bundle of emotions and my thoughts are racing!!