I am unable to spend enough time with my expecting wife and I feel guilty. Will that affect our relationship?

The fact that you feel guilty shows how sincerely concerned you are about your pregnant wife. Have you shared with her how you feel? and if you're not spending enough time with her because you're working hard for your family, I'm sure she will understand. Be open, share how you feel, share the burdens equally and I'm sure that you're relationship will not be affected, but rather, strengthened :)