All the symptoms you’ve mentioned (slight cramping, tightening, flutters, sore breasts, dizzy spells, insomnia, sweating, pee urging…) are very subjective and not persuasive evidence of pregnancy. The same symptoms manifest differently in different women and can be found in many other conditions. Lack of menstruation is considered to be the first serious sign of early pregnancy. Lack of menstruation (amenorrhea) can be found in some other conditions, too, so pregnancy always has to be confirmed with a positive pregnancy test. A pregnancy test is usually administered after missing an expected period, but it can also be pro-actively administered not more than 5 days before the expected period date. In your case, you can do another pregnancy test if you miss your period. If you do get your period, you won’t need a pregnancy test.