Have you told your job?

I am curious and nervous about this as I have only been at my job for 3 months now. The don't allow anybody time off in the first 6 months and typically don't give much maternity leave. Thus I am afraid if I tell them that they will be unhappy and difficult about letting me go to the doctor, which up to this point I have mostly just been able to do on my lunch break. I think it is unlikely I will stay there once baby is born due to their poor employee policies and my having to commute an hour each way. I also have a 3 year old with special needs so that is a factor as well. Legally I know they can't ask me, but it is starting to become noticable and I don't know what to do!