"You can sue for discrimination, but who can be bothered with that when if you dont tell them then there is no hassle. I totally get you op."
If you don't tell them you forfeit all the protection that has been fought for, and won, for pregnant women.
No risk assessment and modification -who would risk the health of their baby to protect 6 weeks at 90% of their wages??
No right to antenatal appointments in work time -possibly essential if you have any complications.
Less protection should they discriminate against you - if you don't tell them you have to prove that they knew about the pregnancy if they discriminate against you. If you tell them, you've got that bit sewn up right from the start.
But, of course, you've decided you're going to have those uncomplicated, uneventful pregnancies which just sail along without putting a bump in your road.
I hope your plan doesn't backfire, because I couldn't imagine the guilt I'd feel if I concealed my pregnancy at work and then miscarried because of the unsuitable working conditions.
By the way, if the risk assessment shows that your work is too dangerous and can't be modified sufficiently, they have to sign you off for the whole pregnancy at full pay. I appreciate that you've got zero hours contracts, but I'm sure there would be a good case for establishing that for the last you always had 40 hours work per week and that apart from your pregnancy, there was no external influence that resulted in a drop in hours, so 40 hours should be taken as your normal working hours.
If you don't tell them, of course, then that protection is also gone.