Thank you for your query.
Abnormal periods warrant a pregnancy test - as it is negative, you should consider other reasons for these.
One is obviously a recurrence of cervical dysplasia
/ cervical erosion as it may cause abnormal spotting / bleeding.
Other than that, stress, anxiety, weight loss
or weight gain, thyroid disorders, polycystic ovaries
, all cause such symptoms.
Cervical polyps or growths or endometrial thickening can lead to irregular periods
The pregnancy symptoms could be because you might be having a very early pregnancy or ectopic pregancy, and this needs to be checked by a gynecologist.