When to tell

Got my bfp today!!! I've only taken one test but I got it this morning. Here's my question: should I go ahead and tell my husband when he wakes up today? Or should I do something cute tomorrow for father's day? It is his first one (we have a one year old) and with his gift I'm planning on giving him a card written from the perspective of our daughter. I was thinking at the end I would write "Ps. And thanks for making me a big sister!" And wait for his reaction. But I don't know if I can wait the day lol thoughts?