Yes, be honest with them.
It depends on how skilled you are and what kind of job it is. If it is financial analyst for a big company, that would be different than if it is delivery person for heavy boxes for a small company. In other words, if pregnancy is not an impediment in any way to doing the job and the company often has people take maternity leave without costing the company a lot of downtime and difficulty with replacement workers, then go ahead and say you just found this out. But in the early interview process for some jobs, especially if the company is small, you will not get a second interview if you tell them you are pregnant. They won't say your pregnancy is the issue, but they won't need to, since it is always possible to find another reason not to hire someone.
I would tell them if they offer you the job, though. Tell them at that time and that you just found out, and tell them that you intend to work through your whole pregnancy and be back at work right after the baby is born, because you need to (or other compelling sounding reason).
It's a smaller but growing company, and my job would not be physically intense so I could work the entirety of my pregnancy. I like the idea of telling them at the offer instead of the interview. I don't want to hinder my chances of getting the job.
I wouldn't, its none of their business this early in the pregnancy....I would wait until after u get hired and even then I would wait until after your 90 days personally
I wouldn't unless they ask and they shouldn't ask.