Do you think 3 classes on campus will be too much?

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So I'll be 30 weeks pregnant when the semester starts. I'm due November 6th. I'm taking 4 classes but one is online. 
The other two are math and a science lab, and I need to take 4 to receive financial aid. But I'm worried because there's no online classes left. So I'm afraid having three classes on campus (40 minutes away) will make it nearly impossible to finish the semester once the baby gets here. Has anyone else had experience in this? What are your suggestions?