Do pregnant women have the right to request to WFH?

I've been thinking if I should ask my boss if there's any possibility of letting me WFH 100% at least during my 1st trimester. However, my concern is that if I was allowed to WFH 100%, other colleagues will start asking. But I don't intend to let them know about my pregnancy until the 2nd trimester. Also, colleagues might find it unfair if I get to WFH 100% but they don't. Am I thinking too much when I should be thinking for myself too? Do we have the right to make such request?