I think you know the answer to this question. Anything is possible if you are having unprotected sex. Take a test, if it's negative wait a few weeks & take another.
Is it possible? Yes. Pregnancy is always a possibility when you have sex, even when it's protected sex.
The best way to know for sure if you're pregnant or not is to take a blood test at the doctor, but home tests work too. Most home tests are less than 20% accurate when taken before a missed period, but it sounds like you got yours, it was just light, so it should be fine to take right away.
Remember though that none of the symptoms you described are exclusive to pregnancy. They're all also PMS symptoms.
Finally, the dark urine is a sign of dehydration. Cut out the juices, tea & milk for a day or two and just focus on drinking plenty of water.
Anytime your having sex, especially unprotected sex, pregnancy is a possibility. The only way to know for sure is to take a test.
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