Suggestions on how to tell your boss ?

Me

Well im 9 weeks and was thinking it was time to tell her since they’ll need to find someone to replace me while I’m on mat leave. I dunno why I’m just nervous. Theres no reason for her to reactive negatively. She was aware when I had a miscarriage in May cause I was off work for 2 weeks and she was understanding. I’m just sooo nervous and can’t bring myself to tell her lolll any suggestions ? Encouragement ?

I’ve been at my workplace for 1 year now so I’m not a newbie. Uggh I hate this I just wanna get it over with ! HELP