It could be pms and because you had sex, your mind is making your pms symptoms (which can be identical to pregnancy symptoms!) into pregnancy symtoms. This is normal and probably causing you a lot of anxiety, which makes you think more about your symptoms, which causes more anxiety.
It the condom was used properly and there were no holes in it, you are not pregnant.
If you are late for your period in a week, go get a pregnancy test.
Most women do not get pregnancy symptoms in the span of a week. Some do but it isn't the usual way things work. Most women don't get symptoms until their period is due or they have missed their period.
Good luck!