Social Security Disability Insurance

I have Stage 4 Ovarian Cancer which was diagnosed in late August, 2017. I applied for SS disabilty insurance right away, and received approval within 2 weeks. The notice that I received says that although my disability has been approved, I will not start to receive benefits until 5 months after my diagnosis. This means that my first check will come in March of 2018 for the month of February. I saw a few posts from some time ago that seemed to indicate that people have started to receive benefits right away. I've checked the SS website and have spoken to SS representatives and have found nothing that might speed up when benefits start... does anyone have info that I was unable to find?

Thanks muchly for your help