I used protection and there was no sperm involved. i've been stressing alot and my period is late. i have all the symptoms of pms . including cramps.

Don't stress: If you are worried about pregnancy take a home pregnancy test. If you are not pregnant it could be you are about to start your period.

Stress: Can be a major factor in influencing your periods- causing it to start later than usual, be more painful than usual, bleed heavier than normal, etc. If your period is more than a week late I would recommend taking a home pregnancy test just to make sure that's not the cause. Otherwise, just hang in there and try some de-stressing techniques like massage, aromatherapy, calming music, etc.