New job that doesn't know I'm pregnant!😞

I'll be starting a new job in about a week as a bank teller, but I'm now 28 weeks pregnant... I didn't tell them when I interviewed that I was pregnant, so I feel that may be deceitful or they will be angry with me... I plan to work right up until I'm going into labor and I'll try to take the least amount of time off as I can... How do I tell them I'm pregnant? Will I be in trouble for this?