Well if you are not available on an emotional level then she is definitely frustrated and realising that she is in loveless marriage. If you want her to be calmer and more respectful, extend yourself and be her friend and explain with love and care that you will not accept her disrespecting your parents or siblings since they are also her parents now. Make her understand that you don't want to be with her when she behaves with badtameezi and that you will make more of an effort to be better as well i.e. You both will agree to make family life calm and loving for your coming child.
Stop with your selfpitying BS , it is not OK to mask your bad behaviour towards your wife by somehow try to flip the situation as being a 'feminist/liberal' issue . It isn't , it is a girl having her first child which is scary anyway , and then having fevers and an unsympathetic even aggressive husband who says kill your child because I don't want to deal with my responsibilities. Not cool , at all
Yes she feels under attack , anyone can see that and it is understandable because girls are taught that children are a blessing , that having a child is something both she and her husband would be joyful about, plus her reserves of patience would probaly be affected by feeling under the weather and puking. She has been told not just surmised that you demand she kill her baby , it is the kind of thing that changes the relationship and trust in the couple permanently- a deal breaker. You overstepped the sikh mark , the humane mark and nobody made you do that , that was your own choice
Your parents told they disagreed with you but you disregarded them and spouted off at your missus. Mend fences with all and apologise to all of them because you threw the emotiinal grenade then left those three to deal with the results.