Devastated

I finally got my bfp a week ago at 12 dpo and had positive digitals for the next two days after that. Yesterday, I started bleeding heavy and cramping. Naturally, I thought I was having a chemical, and a digital test confirmed that I was no longer pregnant. I have never been so devestated in my life. I had put a Mother's Day surprise gift for my mom in the mail to tell her the news. I then had to call her and tell her that I had been pregnant and had lost it. It was the hardest phone call of my life. She wants a grandchild so very bad. Has anyone else recently gone through a chemical? I haven't had the heart to call and cancel my baby appointment with my doctor. I haven't told my doctor about the chemical yet either. Any and all support and feedback is appreciated.