I just received a job offer... do I tell them I am pregnant?

I quit my last job and found out 3 weeks later that I was pregnant. I had quit because I was having medical issues and needing a lot of time off, and I also wanted to try to start my own marketing business. However, everything changed when I saw those two lines, and I have been trying to get another job ever since. I was just offered a job with a company and I have not disclosed my pregnancy. I worried I’d be discriminated against, and also didn’t know how to casually bring it up during the interview. This has made me feel dishonest, but I do not plan on it affecting me working, other than the obvious time off I’ll have to take to deliver. At my start date, I will be 30 weeks pregnant. I am tiny and wasn’t showing much during the interviews so I don’t think they have a clue, but I am showing now. My concern is that they award .69 days time off per pay period and I worry I won’t accrue enough days to take off by my delivery date. I don’t know if I should bring it up to the recruiter before accepting the offer, or if I should just go about my business like I’m not pregnant. I am desperate to work and would take as minimal time off as possible, I just worry I’ll physically be unable to go in to work with the couple days of time off I will have accrued. Any advice is appreciated.