If you are late on your period, take a pregnancy test. There is nothing more that can be said. Your symptoms could be pms symptoms or they could be pregnancy symptoms.
It is highly unlikely you are pregnant. Your sexual encounter was protected with a condom and you more than likely were not near your ovulation time on .April 2.
A pregnancy test will tell you what you want to know and at this point, if you are pregnant, it will be accurate.
Good luck!