Corrected entry: In the early scene where he is showing off his pool prowess in the bar to Claire, Tom actually fouls the red solid ball as it returns up the table. Not such a good example, when he claims "I'm taking you to pool school."
Corrected entry: At the beginning of the movie, Ashley Judd's character is taking an ovulation test because she and her husband are trying to conceive a baby. Later, this theme is reinforced when Morgan Freeman's character offers her a drink and she declines, saying "I'm trying to get pregnant." Shortly thereafter, the two are in a car accident and a hospital nurse later tells her that she lost her baby. But in order for a miscarriage to have been noticed at the hospital Ashley would have had to be at least a couple of months along in her pregnancy - and surely any woman trying so desperately to get pregnant would have noticed a couple of missed periods and even more likely would have been taking pregnancy tests all along.
Correction: during the first trimester some women get what is known as spotting - like a false period. Also although pregnancy tests are usually accurate, they aren't always and it can take a couple of months before they accurately tell you whats up. These two things are both linked to high stress - something which she definitely was in.
Correction: The simplest answer would be she had an ultrasound. When a person is injured in an accident, especially one that renders them unconscious, ultrasounds are commonly performed to look for internal injuries. A pregnancy or loss of one would have been noticed by an ultrasound.
Correction: Even professional pool players, and athletes in other sports make mistakes sometimes. And since he doesn't acknowledge fouling the red ball, it's a little bit of cheating going on in order for him to "school" her.