Constructive dismissal

Grace
I have been having some problems with my boss at work. She has never liked me but I was given the position whilst she was away from work. I went on sick for a month not long ago because I couldn't cope with her anymore. Whilst I was off I found out I was pregnant and slowly realised I was trapped in my job now until I go on maternity leave. She is making my life miserable and even though the primary reason for me taking time off was her behaviour, nothing was done about it. It is such a toxic environment and I know she is trying to force me out but if I leave I will loose any maternity pay I might get. I know that feeling this way can not be good for baby but not having any money to look after my family is not an option - we struggle as it is. I just don't know what to do. Feeling hopeless and trapped at the moment.