SO having my pregnancy symptoms

Ever since I been pregnant my SO have been having a lot of symptoms that I'm suppose to be having. He has been nauseous and throwing up ( (I haven't thrown up yet, he can keep that symptom) ) and always tired. He get sensitive when I talk about certain things and I just got curious on if my SO and I share pregnancy symptoms, come to find out it's true.. Has anyone noticed this change in there SO???