Will there still be ovulation in these days?

Patient's question:

I had my period on December 9th, with a cycle of 33 days. On January 1st, I used an ovulation test kit and got two red lines. On December 25th, an ultrasound showed a follicle size of 16mm x 16mm, and on the 28th, it was 19mm x 17mm. Could I still ovulate in these two days?
First follow-up question: I'm confused—is the issue with the ovulation test kit or with my ovulation? In November, my period came on the 6th, and I ovulated on the 26th (confirmed by a hospital check-up). I didn't use an ovulation test kit then. Why is there a problem this month? Please help me, thank you!!
Second follow-up question: Could you...

Doctor's answer:

Hello, generally, an egg follicle can be discharged when it grows to 1.8-2.0cm. You should continue to monitor whether it is discharged on the 29th, and if it is not discharged, continue to monitor on the 30th. After the egg is discharged, it survives in the body for 24-36 hours, and cohabitation during this period increases the chances of conception.

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