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There is absolutely nothing to be worried about. I assure you that you are not pregnant. In order to become pregnant there are various factors involved such as:
Boy should have ejaculated into the vagina of the girl
The girl should not be having periods and should be in her fertile days which is 3 days before ovulation and 2 days after ovulation
Girl shouldn’t have taken oral contraceptive pills for at least past 1 month because oral contraceptive pills suppress ovulation and fertilization and it will take at least another month to regain the fertility.
You have mentioned that there was no penetration and no ejaculation which means there is no chance of sperm entering into your vagina. You also have mentioned that you had your periods that time which means you are surely not in your fertile periods to get pregnant. So do not try the pregnancy test anymore.
You say you have the problem of irregular periods for long time and now you are having stomach cramps. I guess you are having some gynecological problem, which has to be evaluated with physical examination and appropriate investigations. So I suggest you to right away seek your nearby gynecologist to get the necessary investigations done to regularize your periods.
I am sure you are not pregnant. If you have any further doubts you can freely ask through ask a doctor service in doctorspring.com. we are happy to help you.