Loose tops etc? There's not much you can do to hide it...
my sister hid her pregnancy until she was 8mths from all of us. .. she wore baggy hoody jumpers all the time and nobody noticed!
She also put pads in the bin each month to make sure our mam didn't question her lol
There's a new federal law (I don't know if it passed or not) that gives you more rights towards them cutting your hours. I think it's something like Pregnant Workers Fairness Act or something.
And from my experience, concealing it just makes it more obvious...