Welcome to HCM.
does not mean, you are pregnant, though frequency of urine may be seen in pregnancy
Pain abdomen could be due to a number of causes including bowel gas.
If you have a 28 day cycle, you may get your early morning urine tested for pregnancy tomorrow, otherwise you could wait for a few more days and if still no periods then you could do the test. Hope you get it Positive. Wishing you all the Best.