Telling my father?

Trying to find the best way to tell my father that I am pregnant. Not that I think he will be mad I would just like a good way to do it rather than just sending him a text or calling him. We are planning on telling him next week after our 12 week appointment. My mother already knows because well she's my mother and she could tell I was aroun 6 weeks. However, I would still like to act like she didn't know that way my father won't feel left out of like we were hiding anything from him. Any suggestions on how you told your parents or your SO parents?