My Pregnant Girlfriend

I met her last year we had both worked together for years. She had left I hadnt seen her in a year and she had split up from her husband. I did everything I could to help her she had drug problems financial problems etc. We got together at the end of last year. We emigrated in June but I have had to comeback believe me I didnt want to, she has been pregnant since july baby is due in March. Since being pregnant she has pushed me away. Since being away she has pushed me away been aggressive and decided that is it. Would her pregnancy, hormones etc play any part in this plus her mum seems to think she may be bi polar