My period is a week late. i was sick with a cold 2 weeks ago and have been very stressed. i had sex with a condom. what should i do?

Pregnancy test: If you are concerned then you can try a pregnancy test. Most are very accurate. However, there can be many reasons for being late and you admit to being stressed. Stress can certainly be a cause of being late as can bodily illnesses. Just because you are late does not mean you are pregnant. Condoms are not 100% effective but are needed for std protection (still not 100% for that either).