When are you telling family?

right now I'm 3w4d pregnant with three positives in the last two days. My period isn't due until Monday so I haven't even missed a period yet. BUT I'm really close with my mom and sister, we see each other almost every day and live a few blocks away - I want to tell them so bad!! I have never been pregnant before. I understand that chemical pregnancy is common so I feel a little silly even considering telling anyone before I'm at least a week past my period date BUT GEEZ THIS IS HARD. I'm split on this and I'm a horrible secret keeper so idk.