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Dear Customer
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What is the possible cause of your medical condition ?
if you have unprotected sexual intercourse , and you are not on any contraception method , then you are more likely to be prengnant 
What is the best time to do home pregnancy test :
1. first week of next period 
- you can also go see a gynacologist and do a regular check to your productive system and check if there is any early pregnancy changes , which is also in first 2 weeks of next period 
Early pregnancy signs :
1. delayed period 
2. headache 
3. frequant urination or urge to urinate 
4. changes in breast shape and size and may have some pain 
5. increase vigainal discharge 
6. morning sickness
7. vomiting and abodiminal discomfort 
8. constipation 
9. change in mood stutus 
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
Our advice :
- do the home pregnancy test , get your prior results , and either way consult an OBGYN doctor to give you instructions about pregnancy or get your period on regularity again by medication 
You can also ask our other certified experts in various fields such as: Nutritionists, Lawyers, IT Experts, Therapists, Mechanics, Doctors, Handymen, and more.
Kind Regards