Salam and thank you for your question.

 

Welcome to Islam and may Allah reward you for being keen in following His commandments. May He also make your child’s delivery easy insha’Allah (God willing).

 

Your husband is absolutely right, you must always keep good relations with your mother since this is an order from Allah; Allah says what means:

 

{And your Lord has decreed that you worship none but Him. And that you be dutiful to your parents. If one of them or both of them attain old age in your life, say not to them a word of disrespect, nor shout at them but address them in terms of honor} (Al-Israa, 17:23)

 

I think your mother does not understand what Islam is so you have to find a way to explain to her in a simplistic way. Emphasizing that Islam has changed you to the better.

 

Most importantly, do not give up no matter what the circumstances may be, and make lots of du’a (supplication) so that Allah soften your mother’s heart towards you and to guide her to the straight path insha’Allah.