Should I tell my boss early I'm pregnant?

Audrey • 31 years old. Mom of one little boy 👶🏼 with another bundle on the way! Happily married since ‘16 💏
I have an hour commute each way and I've been struggling to stay awake at work. Im thinking of telling my boss in pregnant to see if I could reduce my hours to 35 a week I stress of 40. I'm almost 10 weeks. I'm also scared of telling my boss then something happening to the baby... but I would need time off if that happened. My boss is a man but he had 4 kids. What do you ladies think 

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