What is the deal with this heartburn??

Lori • Mom of 3 girls 🥰 Should I have one more? 😍
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?