you wouldnt be "pregnant" just yet. Wait til your missed period to test.
You wouldn't be feeling/noticing things this fast. Wait another week and and half and test with first morning urine.
Have you missed your period? Any time a guy c*** in you there is a chance you could be pregnant. but you have to be ovulating. and i dont think you would start to get the symptoms that fast. it usually takes a few weeks. but you can test 2 weeks after you had sex with the first morning urine. good luck!