I need some help.

Aerial • I am married to the most amazing man I`ve ever met. Together we have a beautiful little girl.
Friday I had some spotting so I took a test Saturday with the hopes of being pregnant and of course it was negative. But Saturday I felt full, cramping, and slight back pain. I called my doctor but she didn't seem all that concerned as I start my af on the 13th. Today, I ate lunch and I feel sick. Any suggestions? Anyone experience the same thing?