Help 🙄🙄🙄 😞

So I'm currently 6 months pregnant I got this new job last month in a spa as a receptionist I didn't tell them I was pregnant because I didn't want it to ruin me getting the job because no one wants to hire a pregnant person my old job pretty much fired me cause I was pregnant and now I'm getting bigger and wondering when I should tell them I really like the job just not sure how they will take and if they will try to fire me or in wondering if I should wait until 90 days probation over and they gave me lifting heavy boxes and bending down a lot and I'm doing 10 hour shifts a day