Period delay test paper did not detect, could it be pregnancy?

Patient's question:

Detailed medical condition and consultation purpose: I had my period on the 4th of last month, and on the 10th of this month, I was with my husband. Today is the 17th, and my period hasn't arrived yet. I've been using pregnancy tests recently, but they've all been negative. I had an ultrasound at the hospital this year, and it was fine. Please tell me if I could be pregnant.
Duration of the current illness: One month
Current general condition: Not arrived
Medical history: Irregular periods
Previous diagnoses and treatment history and effectiveness: Irregular menstruation
Ancillary tests: Ultrasound
Other: None

Doctor's answer:

If only occasionally 1—2 menstrual periods are delayed and there are no other accompanying symptoms, it does not fall under the category of menstrual disorders. When the menstrual cycle interval lasts for more than 35 days, it is referred to as menstrual oligomenorrhea, and when menstruation stops for more than 3 menstrual cycles, it is called amenorrhea. Due to the lack of ovulation after amenorrhea, it can also lead to problems such as osteoporosis and endometrial hyperplasia, which must be taken seriously. It is recommended to go to the hospital for examination and treatment.

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