I was signed off sick for one week by my doctor after having a miscarriage at 6 weeks. As I understood, the law says that you can't be disciplined for being off sick while pregnant. However I was already on absence monitoring because of my attendance last year. On my return to work interview my manager said she would be extending my monitoring period because of this sickness. HR are backing her up and I don't know what to do. Are they allowed to do this?