is my mind playing tricks on me

Fredrika • I gave birth to my son, Benicio on September 29th 2017 and recently just gave birth to my daughter, Kalani on November 15th 2018.
I need some advice. I have been having heartburn for about a week or so and I've never had it before. I've been having some abdominal cramps here and there and my left breast is a little tender. I probably tested early my af is supposed to come on the 28th