Possible job offer; horrible timing.?

I have an interview to become a correctional officer at the regional jail here. Its an entry-level position, as I've not done this type of work before but I do want to become a police officer someday, so I think it'll help me get my feet in the water. The problem is that I'm 8 weeks pregnant. Jobs around here, especially those in the jail here are VERY hard to come by. Few and far between, and our jail have a really low turnover rate since theyre pretty much the only employer that has good benefits around here. I HATE to turn it down based on the sole fact that I'm pregnant since I planned to work throughout my entier pregnancy anyway, but I'm afraid if I dont even mention it, I'll be fired anyway, and I'm not even sure of their policy on pregnant officers.. Any advice would be appreciated.