Maternity benefits and termination

I currently work in a IT company and in 6 month of pregnancy and due date in September. It all started with appraisal and they didn't share the appraisal letter and when asked for it, they started saying no hike and there are performance issues and also they will be in loss when I am on leave for 6 months (maternity leave). so they asked me to resign and plan her last working date as maternity due date and then take a break and search for a new company. I resisted to resign and then they now came up with one time 6 month lumsum pay. They are providing 2 options 1. Agree for 6 month lumsum pay and they will decide last working day. 2. if disagreed company will take route of performance issues and make me serve 3 month notice with no maternity benefits ?? I am looking to work till maternity due date and then take maternity benefits one time or over 6 months. PS: i. Nowhere they have given detailed performance issues feedback nor they have shared areas of improvement orally or in written. ii. Joined 8 months ago, successfully completed probation and now full time employee. s I am hardworking and never faced this in my career in last 2 companies. Let's assume company will initiate 3 months notice and can they deny maternity benefits pay either one time or over a period of 6 months just 2 weeks before the maternity leave start date ? Please also share any other valuable suggestions to handle this situation?