I was delayed last October. And this month I have...

Dear Customer
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Our advice :

your medical condition is more likely to be cause by hormonal abnormalties , so we suggest to you to visit an OBGYN doctor to do the needed medical examiantion and determine the suitable treatment pathway 

are you pregnant :

its unlikely to be pregnant in thise case , because you have done pregnant test and came negative twice at the time of next period 

what is the treatment of delayed period :

1. consult GYN doctor to do the needed routine medical test and determine the treatment pathways ( if needed ) 
2. healthy life style including health diet and regular exercise 
3. avoid stress  and have plenty of rest 
4. in case of hormonal changes , doctor may prescribe medication to correct hormones imbalance such as progestin 
5. in case of thyriod hormone abnormalties ( usually accompanied with other symtpoms ) , doctor will prescribe medication such as Levothyroxine
6. in case of other chronic disease such as ovarian cyst ( PCOS ) or other disease , doctor may need addvanced examnation to determine the causes and treatment pathway 

possible other causes to delayed period :

1. malnutrition and low weight 
2. Hormonal changes 
3. Some medications such as Medroxyprogesterone acetate
4. stress
5. Obesity
6. Thyroid diseases
7. gastic system disease (wheat allergy)
8. ovarian cysts 
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Kind Regards