That is what I was thinking also. The chance of a heart attack is slim, but there is nothing wrong with getting to the ER to rule it out.
I don't know but sounds scary and sounds like heart attack symptoms, throwing up can happen with heart attacks as well. I would go to the ER. better safe than sorry.
Call the doctor's after-hours number and see if he wants her to go to the ER.
How many wks is she? Look up hyperemesis gravidum