If there has been no intercourse and no ejaculation of sperm inside the vagina and only dry humping involved with clothes on, then the chances of pregnancy getting established is practically negligible.
The cramps you are experiencing may possibly be because of PMS and indicate that your menses are about to ensue in few days. However, if you happen to miss your periods then to allay any form of doubts, it's always better to do a urine pregnancy test to rule out pregnancy as sometimes stress per se can delay menses as well.
I hope I have answered your query in detail,
wishing you good health,
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.