Sensitive to caffeine pregnancy symptom?

I LOVE coffee. Have been drinking it for a few years. I only drink about 12oz a day, which is a tall cup. That’s not a lot.

For the past week, I have started to get heartburn and I couldn’t figure out why. This isn’t normal for me. Today I took ONE sip of coffee and right away began to have heartburn.

Did anyone else have this symptom as an early pregnancy symptom? It’s weird that my body all of a sudden has become sensitive to caffeine.

I researched this and it’s seems like a thing. Any help or advice would be appreciated!