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.
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!