thank you for your query.
The symptoms that you describe might be related to periods, but are not confirmatory.
tests are 97 % reliable - so if your test is negative, then you are most probably not pregnant.
In the rare event of an early pregnancy not being detected, you can test again by a pregnancy kit test after a week, but better still is to consult a Gynecologist to have a definitive opinion.
She would examine you and check for a pregnancy, at the same time assessing the weird symptoms you have.
Pregnancy is best confirmed with a blood test
compared to a urine test.