I asked on your other post if this is your first child, but see here it is your third! Hm, well. So, you know what is normal for you during childbirth. I think BH are usually, even at third pregnancy, nothing to be too concerned about. Are you well hydrated? That's one reason for getting bh, and it sure is HOT right now. Take it easy and rest a bit more. See if that helps.
I went into l&d 3 times for my mild cramps I get almost whole pregnancy and it is normal as long as no blood they told me so far growth is all it has been