Hi. i am 17 weeks pregnant. is it safe for me to swim in the hot water springs at montagu springs? the water temperature is about 42 degrees. thanks

Only very briefly: 42 degrees is quite hot. There is a danger of developing hyperthermia (increase your in body temperature); it's most risky in the first trimester but not good at any point. It might be difficult to not go in at all but I'd only go in a few minutes (no more than 5) then get out and go in their cool pools, but you can do that a few times. See https://hottubdigest.com/hot-tubs-during-pregnancy/