And if you are 6/7 months pregnant when you graduate, I suspect that it will be difficult to find a job. Of course, it'll have nothing to do with pregnancy discrimination. Then, you will want some time off to be with the baby. Now, you are looking at being an old new grad, which can negatively impact your job prospects.
If you wait until you get a job, get through orientation and then get pregnant, you will be there for a year and you will be eligible for FMLA. It's really not that much different time wise.