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This is very unlikely to be pregnancy related issue. Since your pregnancy test is negative after 1 month, so pregnancy is virtually ruled out.
You require evaluation for irregular periods.
These problems can occur as a result of hormonal imbalance, excessive stress, Polycystic Ovarian Syndrome (PCOS), Thyroid issues.
I would advise you to get investigated.
Get following investigations done:
1. Ultrasound Pelvic organs.
2. Thyroid profile.
If any issues are found you would be treated accordingly.
Share my opinion with your doctor.
I hope it helps.
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