It’s too early to say whether it is premenstrual symptoms or you are pregnant. Wait for your period date and if you miss periods, take a pregnancy test and see. There are ultrasensitive urine tests available too through which you can confirm pregnancy about 3-4 days before the due date of periods, but if the test is negative, you will need to repeat the test if you miss periods. Take care!
The cramp would be the egg releasing from one of your ovaries, most people get that. There could be a risk that the condom slipped or ripped whilst intercourse, so take a pregnancy test just in case. The symptons your getting just might be pre-menstrual syndrome.