You are suffering from irregular vaginal bleeding/spotting for last 2 months with two HPT negative.
First of all,do a USG lower abdomen and some hormonal
test like thyroid
profile,LH/FSH etc to rule out underlying pathology or product of conception if any.
Reasons that to be considered are hormonal imbalance,stress/anxiety,Ovarian cyst
,thyroid problem, Weight gain/extreme loss,irregular eating habits etc. Consult with your gynecologist for clinical evaluation and take suggestive measures.
Avoid stress,take healthy diet,control body wt,take some medication like Tab Drotin DS for cramp or Pantoprazole
(PPI),maintain personal hygiene and need proper sleep.