It's incredibly important, especially if you're a woman, to realize that a lot of heart attacks don't look like they do in Hollywood.
You aren't always going to be warned by pain in your arm or in your chest. Women in particular often suffer from other symptoms like sudden pain in the jaw.
If you get jaw pain on one side and have other symptoms like breathlessness, you should pay attention and, if possible, go to a hospital. The best thing is if they can catch a heart attack early.