Is it normal for pregnancy to weaken your immune system?

Yes, pregnancy does weaken your immune system. I am currently pregnant and taking progesterone shots. My doctor told me that the immune system is weaker during pregnancy and progesterone also weakens the immune system. I caught a cold from a student last June and was sick all summer! I guess it is just something we have to deal with. You can have your doctor prescribe antibiotics that are safe for you to take during pregnancy. Good luck and feel better!