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

yes definitely it will somehow affect your relationship . When wife is expecting they need more attention and also more concern and time spend if not they might overthink. I m same as you , i m a first time daddy and i work day and night and time spend together are really limited and our relationship affected . When my wife told me i was guilty and i try spending more time with her to make her feel that she is not alone . Because pregnancy hormones also make them feel stress. Despite i m the only finance provider at home , i will still try my best to spend both time and work with my wife !