Financial help needed - family of 5 struggled

We struggle. We are a young family (28 & 27) with a 3 year old child. We are expecting twins and are struggling quite hard as to how we are going to manage this - financially. My girlfriend is a student and has finished her studies since May. We love children, so we really wanted a second one. The plan was for her to go to work and then take parental leave with parental allowance. Due to the high-risk pregnancy, she is not allowed to go to work; rest with bed rest (medically necessary) is recommended. Dah