As I understand, there should be no laying off as long as you are expecting and on your maternity & parental leave. ---I think you should acknowledge your employer about your pregnancy with a letter from your family doctor.
Maternity benefits are payable to the birth mother (or surrogate mother) for a maximum of 15 weeks. The mother can start collecting maternity benefits either up to 8 weeks before she is expected to give birth or at the week she gives birth. Maternity benefits can be collected within 17 weeks of the actual or expected week of birth, whichever is later.
Parental benefits are payable either to the biological or adoptive parents while they are caring for a new-born or an adopted child, up to a maximum of 35 weeks. Parental benefits can be claimed by one parent or shared between the two partners but will not exceed a combined maximum of 35 weeks. Parental benefits are only available within the 52 weeks following the child's birth, or for adoptive parents, within the 52 weeks from the date the child is placed with you, unless your child is hospitalized