Thanks for the query.
As your beta hCG test is negative there is very less possibility for pregnancy
The scanty flow you had previously could be due to some other causes like hormonal
imbalance, poly cystic ovary disease, anemia, thyroid abnormalities etc.
The symptoms you mentioned could be seen in other conditions like irritable bowel syndrome
So you better consult gynecologist get examined, go for ultrasound
and if needed for hormonal profile. With this workup the possible cause for your problem can be identified and treatment can be given.