I'm using yaz pills and then only 1 tablet left...

Delayed period :
First of all you have to exclude pregnancy as it's the most common cause for delayed period in your condition . If pregnancy tests were negative your doctor will prescribe medication such as Cidolut nor twice daily for 3 weeks and follow up your condition .
What are the causes of menstrual cycle delay ?

• Stress amd Anxiety
• Pregnancy 
• Hypothyroidism 
• High prolactine
• Hormonal disturbance
• PCO polycystic ovary
• Thyroid dysfunction
• Pelvic inflammatory diseases

What are the sign and symptoms of Pregnancy ?
There are many signs and symptoms which can increase your suspicion of pregnancy , and these include :

1. Delayed period .
2. Abdominal pain .
3. low back pain .
4. Breast pain .
5. Nausea and vomiting .
6. Changes in appetite .
7. Positive pregnancy tests .

 What are the required tests ?
Clinical assessment for the signs and symptoms and urine pregnancy test if your period was delayed or Blood Hcg level . Your doctor will do US Abdomen and FSH , LH with TSH And Prolactine for thyroid disorders and Hyperprolactinemia .

Dear customer, if the condom is not torn during intercourse, pregnancy cannot occur. Contraceptive pills reduce the chance of pregnancy very highly, but do not prevent it from happening permanently, especially if one of the doses is forgotten