Regarding Marriage Problem & Child Custody

My previous question was all about current situation I want to say my before marriage discussion with in - laws family --" I got married March 2016. I have arranged marriage. Before marriage, I didn't face any problem from my in laws family.They didn't want any dowry, golden jwellery etc. I told them , after marriage i will do my job. I will never left my job. They told me okay, No problem. They also told me that my husband will shift Kolkata, so we didn't have any problem. Then I also told them-- if my husband didn't shifted in kolkata, then also I will never go in husband location. If got suitable job thn I will move otherwise not. My husband shifted job in jamshedpur instead of kolkata." My husband has no IQ level, he is saying his mothers opinion. if his mother tell - do this or do say, then he will say or work as per his mother wish. That is also big problem. In october 2016, there was big quarrel -- they have insulted me 1. His mother told him --"i am planning to separate my husband from his mother in circustic way." . In that way, he told me that sentence. 2. his mother told him dont go for physical relation. my husband didn't come for physically relation. instead of that he told me that have you got married to me for physically relation or baby? I have told him if dnt get baby then what will be my future. baby & physical relation all are parts of the marriage. when you have come to marry me then you should know about all. 3. After that his mother told my father 'Please take your daughter & go home, this relation wouldn't stay no longer. My father told them -- breaking relationship is so easy, making relationship is so difficult. I want to give my daughter that a opportunity. 4. after that i stay there. i go to jamshedpur in weekend. & he also come in shibpur. According to my husband opinion, I stay with inlaws family & come to my maternal house if i got late. because south kolkata is more near than shibpur. & also there is an life risk. In that all is continuing well. Recently , suddenly, all family members are saying it will be okay, if take baby, then my husband threated me we will have baby if you leave your job. In my office, I will get every support. my hr management knows about my situation. If i got pregnant, 1. i will get 6month maternity leave. 2. My pregnancy surgery all cost i will get from my office. 2lacs is coverage for me if get surgery. 3. how to maintain my child : i.after ending leave I will rent a maid from center for my child. my office have a opportunity work from home. if get problem, then I will take work from home. ii. my income till now 25000 per month. I am one child of my parents. my father was bank manager of ubi. now he has retired. my inlaws house is Shibpur howrah, west bangal, india. My maternal house is in south kolkata. iii. I have enough support from my parents. after birth my baby, my husband isnot needed to take any responsibility of my baby . I will take all responsibility. But i have scared that if inlaws family try to leave my job after birth my baby. If I left my inlaws house with new born baby & take all responsibility very well. then Can I get custody of my child in whole life.?