Symptoms of nausea and the others you described are more likely to be caused by something like the flu, though, or some other illness or even anxiety. You would not experience nausea two days after sex in which the condom broke; sometimes it takes that long just for the sperm to travel and meet the egg.

I'm trying to figure out how you are a week late when you are what sounds like your period. If you are bleeding from your vagina and its heavy flow, that is your period. But if you are really worried take a test. Also, it's best if you are on birth control. If you can't get on it though, keep using condoms, and if the condom breaks, see your doctor (if you are under seventeen) about getting Plan B.