First of all, you need to get your wife some parental care by making sure that she is taking her prenatal vitamins properly. Insist her to follow all instructions of the physician which will help her to stay in good health during pregnancy.
Make sure you do not let your wife do anything that her physician has restricted from. Always try to convince her for not doing anything that could hard her health or the health of yet to born child.
Try to keep yourself relaxed while sitting beside or in front of your wife and keep smiling while talking to her. It will give her a soothing effect and she will stay happy during pregnancy.
Usually pregnancy makes females stressed and you have to take care of your wife and try your best to keep her normal.
Be patient and do not react if your wife behaves in an odd manner. Try to understand that she is under stress. You should not reveal any disapproving expressions of your face as it will make her more tensed.
If she is doing household work, try your best to help her as much as possible. Make sure you give your wife as much rest as possible. However, it is better that you convince her not to work especially when the delivery time is near.
Always make her realise that you are with her. Talk about a beautiful future and also ensure her that you love her so much. It will keep her happy during pregnancy which will keep her safe and healthy.
Talk about the future of your baby with your wife and try to keep her engaged which will not let her feel sad about anything and she will remain relaxed.