It is certainly possible to have a skipped period and not due to pregnancy ( an anovulatory cycle is possible to cause that )
However if you had only set of pregnancy tests a month ago I do agree that this should be repeated ...
The most important diagnosis TO NOT MISS would you being pregnant !!
So repeat pregnancy test -- yes !
Other possible causes may be present but the pregnancy issue is of course key to be certain of ...
If you are having ongoing significant pelvic pain then your gynecologist should be aware of this as well
It sounds that you need a pelvic exam and ultrasound likely
I hope that this information is helpful for you
Let me know if you have further questions or concerns
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Thank you and Best Regards,
Anthony Bray MD