It is a sharp pain randomly, about once an hour, lasting about a minute, I am not sure If it is my breast growing, heartburn, or if something is wrong with my heart. Please, any advice would be greatly appreciated.
Any irregular heartbeat or just the pain? I'd call your doctor if you have any questions - even if the office is closed, they will have someone on call that you can ask.
Heartburn isn't a chest pain. If it's happening that long and that consistently and it's a sharp pain I would go to the e.r. I'm honestly not sure what it could be there's a ton of different things. Better safe then sorry is how I feel about medical situations especially when you are pregnant because not only could it put you in danger but also your baby.
I've had this before too. I take it this is your first? I had a lot of pain right in the middle of my chest, between my breasts. It was horrible. I asked my dr. about it once and she said that it was my body getting ready to stretch out for the baby. It seems a bit early for you though. I'm sure you're not even showing yet. I would suggest talking to a dr. about this.