What is the deal with this heartburn??

Lori • Used this app to conceive our first; who just turned 1! Now we are surprised to be pregnant again with baby number 2!
I had never gotten heartburn before, until about a year ago. I will now get a couple days of really bad heartburn and since I have started tracking my fertility days, I've noticed I get heartburn right after I ovulate. What's up with that? Does this mean anything? Anyone else in a similar boat?